Opportunities to Address Climate Change in the Next Farm Bill

This post is part of the Environmental Law Review Syndicate, a multi-school online forum run by student editors from the nation’s leading environmental law reviews.


Opportunities to Address Climate Change in the Next Farm Bill[1]

By Sara Dewey,[2] Liz Hanson,[3] & Claire Horan[4]


The Farm Bill affects nearly every aspect of agriculture and forestry in the United States. Therefore, its next reauthorization offers an important opportunity to better manage the risks of climate change on farms, forests, and ranches by supporting resilience practices that also offer greenhouse gas (GHG) emission reductions.

Agriculture is vulnerable to the impacts of climate change, including rising temperatures, changes in rainfall and pest migration patterns, extreme weather events, and drought. In addition to being heavily affected by climate change, agriculture is also a significant contributor to climate change. Agricultural practices are responsible for about eight percent of U.S. GHG emissions.[5] Estimates of total food system emissions, which include the CO2 emissions from energy use and transportation, increase the agricultural industry’s proportion of U.S. GHG emissions to between 19 and 29 percent.[6]

To better align their practices with their long-term interests, farmers and ranchers can adopt practices that enhance their resilience, while also reducing GHG emissions, and increasing carbon sequestration. Many of these practices improve the long-term productivity and profitability of farms. For example, farmers are already adopting practices that reduce emissions or sequester carbon in the soil and in woody biomass while also improving productivity and resilience on their land.

This paper proposes a suite of practices that should be considered during the next authorization of the Farm Bill to improve on-farm efforts to adapt to and mitigate climate impacts. It is organized into four main sections. Part I provides background on the Farm Bill and the ways that the U.S. agricultural system contributes to GHG emissions. Part II provides an overview of opportunities for on-farm mitigation and adaptation. Many of the practices we recommend can reduce on-farm emissions and build a more resilient agricultural system. Part III identifies a set of metrics that we used to assess potential proposals. Lastly, Part IV summarizes how climate practices can be incorporated across titles and highlights three policy options.

I. Background

A. Agricultural Sources of GHG Emissions

Greenhouse gases trap heat in the atmosphere and contribute to increases in global temperatures. Although this a natural process, increased greenhouse gas emissions since the industrial revolution have increased atmospheric greenhouse gases to levels never before recorded. Agriculture, including raising crops and animals as well as resulting land use changes and farm equipment usage, is a source of three GHGs: methane (CH4), nitrous oxide (N2O), and carbon dioxide (CO2).[7]

Figure 1. GHG Profiles[8]


Globally, emissions from food systems are responsible for nearly a third of all GHG emissions.[9] Domestically, EPA’s Inventory of U.S. Greenhouse Gas Emissions and Sinks divides up agriculture-related emissions into different categories. N2O and CH4 emissions are categorized as “Agricultural,” and accounted for 8.3 percent of total greenhouse gas emissions in the United States in 2014.[10] In 2014, N2O emissions were 336 million metric tons of carbon dioxide equivalent (MMT CO2 Eq.); these emissions were caused primarily by soil management such as the use of synthetic fertilizers, tillage, and organic soil amendments.[11] Manure management, and biomass burning, also contribute to N2O emissions. CH4 emissions were 238 MMT CO2 Eq. and were produced by enteric fermentation during ruminant digestion (164 MMT CO2 Eq.), manure management (61 MMT CO2 Eq.), and the wetland cultivation of rice (12 MMT CO2 Eq.)[12]

CO2 emissions from agriculture-related land use changes and equipment usage are accounted for in the “Land Use, Land-Use Change, and Forestry” and the “Energy” categories, respectively. Estimates of total food system emissions, which include the CO2 emissions from energy use and transportation, increase the agricultural industry’s proportion of U.S. GHG emissions to between 19 and 29%.[13]

II. Strategies for Managing Climate Risk through Mitigation and Adaptation

Given agriculture’s contributions to GHG emissions that are contributing to climate change, which in turn affects agricultural productivity, it is appropriate to consider how climate change can be incorporated across the titles of the Farm Bill. The anticipated reauthorization in 2018 can play a critical role in addressing climate change in the United States by promoting practices that encourage mitigation and adaptation practices on farms.

Adopting new agricultural practices can be challenging, especially for small farmers or operations without access to large amounts of capital or information about adaptation opportunities. However, doing so will not only assist the U.S. farmers and ranchers confront shifting seasons, more severe storm events, new pests, drought, and other challenges,[14] it will also reduce the Farm Bill’s fiscal burden on taxpayers.[15] A number of land managers are already adopting strategies that not only reduce emissions or sequester carbon in the soil, but also have the important co-benefits of improving productivity and resilience.[16]

A. Mitigation Measures

Land managers can mitigate GHG emissions by offsetting current emissions, sequestering carbon, and/or preventing future emissions.[17] Figure 2 describes these strategies and the practices to achieve them.

First, land managers can reduce the GHG emissions of their farming practices in a number of ways. Practices such as conservation tillage reduce soil disturbance, and prevent some erosion, which can lower soil carbon loss. Precision agriculture strategies can reduce fertilizer inputs on cropland, which in turn reduces GHG emissions from fertilizer production and application.[18] Reincorporating livestock manure onto cropland as well as improved management of liquid manure using anaerobic digesters or other on-farm technology can reduce methane emissions from livestock waste by capturing it rather than emitting it.[19]

Second, land managers can sequester additional carbon through on-farm practices. Soil carbon can be increased by incorporating cover crops, including legumes, into crop rotations, reducing tillage, and agroforestry practices.[20] In addition, planting perennial crops or incorporating trees into farms through alley cropping, hedgerows, and riparian forest buffers can lead to long-term sequestration of carbon in woody biomass.

Finally, land managers can take steps to avoid future emissions. The most critical way to avoid new on-farm emissions is to avoid land conversion, which releases carbon that was previously sequestered in the soil and in woody biomass.

Figure 2. Practices for agricultural greenhouse gas mitigation[21]


B. Adaptation Measures

Adapting to a changing climate will require farmers, foresters, and ranchers to prepare for and respond to new risks, including extreme weather events, shifts in growing seasons, and different pests and plant diseases. Figure 3 provides an overview of the range of practices that farmers can undertake to adapt to climate change.

To make farming operations more resilient, farmers can enhance soil health, which will make agricultural systems better able to withstand extreme weather, drought, and erosion due to high winds or flooding.[22] Strategies for enhancing soil health include adjusting production inputs, timing of planting and soil amendments, cover crops, tillage, new crop species, and diversified crop rotations.[23]

Farmers can also take additional steps to make their farms more resilient to other climate risks. For example, to prepare for flooding, heavy rainfall, and other risks, farmers can implement resilient farm landscapes that include buffer strips and the return of marginal cropland to native vegetation. To prepare for new pests and diseases, farmers can diversify their crop selection and alter crop rotations. To adjust to changing seasons and a warming climate, farmers can plant different crops; crop scientists can also develop more heat- and drought-resistant crop varieties. Resilience planning is also important on the community level, as rural communities can ensure that new infrastructure investments supported by the Farm Bill, such as rural water and energy systems, are resilient to climate change effects.

Figure 3. Practices for agricultural adaptation to climate change[24]


C. Opportunities for Complementary Mitigation and Adaptation

Importantly, many on-farm practices can help with both climate adaptation and mitigation.[25] For example, improving soil health not only mitigates climate change, it also makes farms more resilient and better able to withstand the shifting, and at times extreme, conditions of a changing climate. Efficient fertilizer application will reduce GHG emissions while enhancing soil resilience. Similarly, cover cropping, diversified crops, and other practices that stabilize the soil will reduce GHG emissions from the soil while building soil health. It is important to note that the efficiency of these on-farm practices will vary by region, impacting the ways they can and should be implemented.[26]

Mitigation and adaptation strategies for agricultural systems often require long-term planning to strengthen “climate-sensitive assets,” such as soil and water, over time and in changing conditions.[27] Developing better regionally specific agricultural climate and conservation practice adoption data is required for this long-term planning to be successful. From those baseline data, regional efforts will be critical to identify mitigation opportunities, develop strategic adaptation planning, and implement enhanced soil and livestock management practices.[28]

III. Metrics for Prioritizing Reform Proposals

As the summary above indicates, there are many actions that can promote climate change mitigation or adaptation in agriculture. In addition, changes can be made to every Title of the Farm Bill that would promote one or more of these mitigation and adaptation strategies. Given this complexity, the uncertainties associated with quantitative estimates of the mitigation potential of different strategies, and the qualitative differences between mitigation and adaptation as goals, we developed a range of qualitative metrics that we used to analyze potential reforms. In particular, we considered:

Potential magnitude of climate impact: Priority was given to proposals that had proven climate benefits, did not require significant additional research, and targeted the largest sources of agricultural GHG emissions.

Co-benefits: Priority was given to proposals that could increase resiliency or economic benefits of farms.

Equity: Priority was given to programs that could benefit small and large farms in all regions.

Scalability: Priority was given to proposals that seemed replicable and applicable to farms across the country or where Climate Hubs could facilitate regional diversity.

Enforceability/Administrability: Priority was given to proposals that could be tied in with or build upon existing requirements or programs in the Farm Bill.

Feasibility: Feasibility considerations included ease of implementation technically, economically, and politically. Because any legislative change will need to be passed in Congress, political feasibility was determined to be one of the most important considerations. Accordingly, we prioritized proposals that seemed, based on stakeholder engagement, suitable for the next Farm Bill, given competing interests for funding and stakeholder sentiment towards climate action.

An analysis of these metrics is included throughout our recommendations. However, these should be considered as only a first step. While we have attempted to target the largest sources of GHG emissions, more detailed proposals will be required before there can be precise estimates of the potential for emission reductions. The USDA’s COMET-Farm, an online farm and ranch GHG accounting tool, can likely facilitate this effort.[29] Similarly, determining the economic feasibility of specific reform proposals has been difficult because of taxpayer subsidization, the uncertainty of how appropriations may be allocated, and the varying degrees of stringency that reforms could encompass (e.g. mandate vs. incentive). Finally, while previous Farm Bill reauthorizations can serve as a guide, the ongoing transitions at U.S. federal agencies engaged in Farm Bill programs will likely have impacts on the political feasibility of proposals that cannot be appropriately assessed at this time. For these reasons, we recommend that additional research measure the climate impact of proposals, outline the benefits and co-benefits for farmers and the public, articulate the administrability of the program, and gather stakeholder input and support for proposals.

IV. Pathways for Addressing Climate Change in the Farm Bill

To determine how the Farm Bill could better address climate change, we first categorized the range of mitigation and adaptation practices identified in Figures 2 and 3, above, in terms of their potential applicability to the Farm Bill. We then examined how these practices mapped onto the current titles in the Farm Bill. Finally, we assessed how the upcoming Farm Bill could better incentivize these actions across titles, with an eye toward win-win practices with both mitigation and adaptation benefits.

Figure 4 contains the range of possibilities we identified for addressing climate mitigation and adaptation by title. To fully assess the impact of each of these policy options – and its interaction with other policies and programs –requires additional research and outreach to stakeholders affected. We discuss in more detail below a set of recommendations that best fit our metrics, indicated by bold font in this table.

Figure 4. Options for Addressing Climate Change by Farm Bill Title

Figure4 Figure4_pt2

All of these areas for reform have the potential to advance climate-ready agricultural practices through the Farm Bill. Many of these areas for reform also have wide-ranging benefits beyond climate change mitigation or adaptation such as enhancing on-farm productivity and more efficiently using taxpayer dollars. We elected to focus on three recommendations we judged to be particularly important based on the metrics we established in Part III).

Recommendation 1: Incorporate climate measures into crop insurance and conservation compliance to better manage on-farm climate risks under Title II (Conservation) and Title XI (Crop Insurance).

Recommendation 2: Ensure the best available science and research—including the outcome of pilot programs—are incorporated into Farm Bill programs; support dissemination of downscaled climate data through USDA regional offices and land grant universities to develop agricultural climate mitigation and adaptation capacity under Title VII.

Recommendation 3: Advance manure management collection and storage methods, as well as biogas development under Title IX to mitigate GHG contributions from livestock.

Recommendation 1: Incorporate Climate into Crop Insurance and Conservation Compliance

a. Reform crop insurance to incentivize climate risk management and eliminate disincentives for adopting climate-friendly practices

Crop insurance, Title XI, makes government-subsidized crop insurance available to producers who purchase a policy covering losses in yield, crop revenue, or whole farm revenue. Farmers can select and combine several types of crop insurance policies: catastrophic coverage, “buy-up” coverage, and a supplemental coverage option for selected crops. USDA’s Risk Management Agency (RMA) sets insurance premium subsidy rates and develops specific contracts,[30] working with 18 insurance companies to administer the program.[31]

Crop insurance is deeply subsidized by the federal government, and it represents the single largest federal outlay in the farm safety net.[32] On average, taxpayers cover 62 percent of crop insurance premiums.[33] The insurance companies’ losses are reinsured by USDA, and the government also reimburses their administrative and operating costs.[34] The Congressional Budget Office anticipates that this program will cost taxpayers over $40 billion from 2016 to 2020.[35]

These subsidies disproportionately benefit large farms: while only about 15 percent of farms use crop insurance, insured farms account for 70 percent of U.S. cropland.[36] Small farmers struggle to utilize crop insurance because of the high administrative burden and challenges of insuring specialty crops.[37] In addition to clear equity concerns involving access to crop insurance, this situation is problematic from a climate perspective because larger farms are more likely to grow monocultures, which are both more vulnerable to pests and extreme weather events and can degrade soil health. Indeed, just four crops—corn, cotton, soybeans, and wheat—make up about 70 percent of total acres enrolled in crop insurance.[38]

The current loss coverage policies in the crop insurance program can discourage farmers from proactively reducing their risks by taking steps to enhance soil health and resilience. Because farmers with crop insurance are protected against losses incurred from impacts likely to increase with climate change, farmers may not be properly incentivized to respond to the changing conditions.[39] Some environmental organizations have even raised concerns that in response to the crop insurance transfer of risk, some farmers may be more willing to engage in unsustainable practices, such as aggressive expansion, irresponsible management, and use of marginal land.[40] In addition, farmers may make planting decisions based on the insurance program incentives rather than market-based signals.[41] In these ways, crop insurance can push farmers towards practices that pose risks to both their operations and taxpayer obligations.[42] It is therefore important that the crop insurance program better align farmers’ risk management incentives with the real and growing risks they face from climate change.

One way to achieve this objective is through incentivizing or requiring farmers to undertake actions to improve soil management and promote soil health. Some specific changes to the crop insurance program that could promote these practices include:

  • Incorporating climate projections to account for changing growing seasons and planting dates.
  • Providing insurance premium rebates for farmers who voluntarily undertake beneficial practices.
  • Incentivizing improved soil management practices, diversified crops, and manure management.
  • Adjusting the length of policies to better reflect the value added from changes that improve long-term soil health.
  • Writing soil health requirements into insurance policies.

More generally, changes to the crop insurance program that reduce the magnitude of the subsidy offered to farmers, such as setting a dollar-per-acre cap, could reduce the moral hazard that current policies create.[43] The methodology used to set premiums could also be adjusted to be based more on the projected frequency and intensity of events such as droughts and floods rather than on backward-looking data. RMA has started to incorporate climate-related risk metrics into annual rates by weighting recent loss experience more heavily, thereby more accurately reflecting the risks that growers face. However, it is important to consider future risks from climate change as well.

Requirements of the crop insurance program that act as disincentives to climate-friendly farming practices should be updated to account for growing climate risks farmers face. For example, RMA has guidelines in place about the termination of cover crops, because of concerns that these crops will scavenge water from the commodity crops.[44] This requirement can act as a disincentive to farmers’ adoption of cover cropping, a practice that builds the soil and reduces runoff in the non-growing season.[45] The next Farm Bill could specify that there should be no specific termination requirements for cover crops.

Insurance policies may also serve to incentivize some environmentally harmful practices, such as early and excess fertilizer application and cultivation of environmentally sensitive land.[46] Because early application maximizes crops’ uptake of nitrogen, it can increase yield in the short term, but it contributes to nitrous oxide emissions, unhealthy soils that become less able to fix nitrogen and must rely increasingly on fertilizer, and polluted runoff. In addition, synthetic fertilizers, which are made from non-renewable materials, including petroleum and potash, are produced at a huge energy cost.[47] Some studies have suggested that crop insurance may incent some farmers to convert highly erodible or wetlands to farmland.[48] Therefore, the next Farm Bill could also indicate this type of practice is not required to be eligible for crop insurance. This change could be complemented by an increase in the length of insurance policies, as discussed above, because insurance companies would benefit from the longer-term improvements in soil health.

b. Tie crop insurance to a new conservation compliance provision for building soil health for climate ready agriculture

Currently, in order to qualify for crop insurance, farmers must satisfy two conservation compliance requirements, the Wetland Conservation (“Swampbuster”) and Highly Erodible Land Conservation (“Sodbuster”) provisions.[49] These provisions ensure, respectively, that farmers do not convert a wetland or plant crops on highly erodible land or a previously converted wetland.[50] While these current conservation requirements are beneficial in addressing some climate impacts, adding a conservation compliance requirement directly targeted at climate-related practices would improve upon them.

With 70 percent of farmland in the crop insurance program, changes in conservation compliance through the next Farm Bill or through RMA’s policies can drive big climate change benefits. Under Title II, Congress could create an additional conservation compliance requirement for climate-friendly agricultural practices, which could either be required to obtain crop insurance or could make farmers eligible for rebates. The types of on-farm practices that could mitigate risk and enhance climate resilience include more precise irrigation and fertilizer application, reduced tillage of the soil, cover cropping, altering crop rotations, and building buffer strips and riparian buffers. Particularly beneficial practices for building resilient soil include cover cropping, diversified crop rotations, reducing tillage, and efficient irrigation.[51]

In addition, enforcement gaps have limited the success of the existing conservation compliance requirements. To make the mechanism effective, it will be important to establish simple and effective enforcement, for example by using remote sensing, and to ensure that Natural Resources Conservation Service (NRCS) offices have sufficient resources to carry out enforcement efforts.

First, these proposals could produce significant climate benefits from increasing soil health, in terms of both mitigation and adaptation. Reform of the crop insurance and conservation titles could also help address some of the equity issues that currently exist between small and large farms. Existing USDA programs, described in the next section, could help with scalability and administrability. Finally, in terms of feasibility, while any change may be difficult, our stakeholder engagement indicated that farmers are open to programs that target soil health, given the potential economic benefits to their farms. While the actual on-farm impacts will vary based on how the program is designed and constructed, building more resilient, healthy soil can help improve environmental outcomes and decrease the risk of crop loss.[52]

Recommendation 2: Ensure Best Available Science and Research Guides Farm Bill Programs

Agricultural practices that promote climate change mitigation and adaptation, including those described above, are often regionally specific in their implementation. For many new climate-ready practices to be included in conservation compliance or crop insurance, the USDA would need to account for this regional specificity. For example, the benefits of many of the on-farm practices that improve soil health, including more precise irrigation and fertilizer application, reduced tillage of the soil, and altering crop rotations, vary by region and soil type. In some areas, no-till methods may be infeasible; farmers who try to implement no-till in these areas would likely continue to till to some degree or after a short period of time, resulting in quick reversal of the achieved carbon sequestration benefits. Furthermore, the technical specificity of choosing among these practices and correctly implementing them requires guidance at a local level.

To address these types of knowledge gaps and to provide technical assistance to states and farmers, the USDA has created a range of programs, including Climate Hubs, which were established at public land-grant universities in 2014.[53] The Hubs deliver science-based knowledge, practical information, and program support for farmers to engage in “climate-informed decision-making” by farmers.[54]

Increasing funding in the 2018 Farm Bill in Title VII, the Research title, could solidify and expand USDA’s ability to administer and scale climate research and outreach efforts across all regions of the country. Additionally, creating systems to collect and analyze regional data on pilot programs and ensure best practices are adopted could assist long-term efforts to incorporate climate policies into Farm Bill programs.[55] For these reasons the Farm Bill should provide additional funding for climate research and monitoring, especially focused on regional resilience.

Recommendation 3: Address the Significant GHG Contributions of Livestock Management

Improving livestock management, especially manure management, is a significant opportunity for mitigating emissions of methane and achieving several co-benefits for the public and farmers. There is currently very little regulation of livestock manure management. Manure is sometimes stored—uncovered—in a single collection site, which causes the methane to be released directly into the atmosphere. In addition to being a major GHG emissions source, it can cause a range of considerable environmental harms.[56]

a. Require improved manure management, including the covering of lagoons

First, the upcoming Farm Bill could address manure management collection and storage methods. Practices can be improved through actions such as allowing livestock to roam,[57] covering manure lagoons, flaring the methane produced, or producing biogas for use. Simply covering a manure lagoon results in significant decreases in methane emissions, as well as decreased odors. Flaring is the combustion of methane, which yields water and carbon dioxide. Although flaring still emits GHGs, carbon dioxide is a less potent GHG than methane.

The Farm Bill could promote these practices either through incentives or mandates in the Conservation or Crop Insurance titles. For example, the Farm Bill could mandate or incentivize farmers with a threshold number of cattle, swine, or poultry cover manure and flare the produced methane to be eligible for crop insurance. Such a mandate would have the greatest impact at Concentrated Animal Feeding Operations (CAFOs), which may also be better able to bear the high capital costs associated with biogas production

b. Pursue strategies to decrease methane emissions, including biogas and other on-farm renewable energy production

Second, the Energy Title could incentivize on-farm biogas. On farms, many different substrates may be used to produce biogas, including animal excrements (including that of cattle, swine, poultry,[58] and horse), food waste, milling by-products, and catch crops (such as clover grass on farms without livestock).[59] Farmers can realize substantial savings from biogas production, including through substituting biogas for other energy sources, through substituting digestate[60] for commercial fertilizers,[61] and by avoiding disposal and treatment of substrates (such as for waste-water treatment). Farmers may also be able to sell carbon offsets.[62] In addition, farmers producing biogas can avoid some of the worst problems with animal agriculture: farmers must do something with the manure, and its storage can produce strong odors,[63] unhealthy conditions for workers and families,[64] and pollution through runoff in the worst scenarios.[65]

Farmers have two main options for biogas use: (1) generation of electricity for on-site use or sale to the grid; and (2) direct use of biogas locally, either on-site or nearby.[66] Using the biogas to fuel a generator to produce electricity is considered the most profitable use for most farms.[67] Another use is to upgrade the biogas, then called biomethane, to be injected into the national natural gas pipeline network as a substitute for extracted natural gas.

Because farmers could benefit financially from on-farm use or the sale of biogas, the Farm Bill should continue and expand funding for the Rural Energy for America Program, which offers cost-sharing grants and loans for renewable energy improvements. [68] However, these programs are most likely to benefit large farms because anaerobic digesters are expensive and require a large and constant supply of substrate to produce a return on investment. We therefore suggest the Farm Bill also fund pilot programs to assist small farm communities to form cooperatives so that they are also able to utilize this technology and participate in the grant or loan program.

Even with the available grants and loans, farmers are still taking a substantial financial risk. USDA or land-grant universities should actively help communities or cooperatives with the planning and application process. Large farms or cooperatives who are unable or unwilling to operate and maintain anaerobic digesters themselves could hire a company to lease the equipment and manage the biogas production process.[69] USDA Rural Development Agencies could be a valuable liaison between biogas management companies and farmers.

CAFOs could be part of a voluntary program or required to use anaerobic digesters due to their greater contribution to climate change and other environmental harms. Because CAFOs are responsible for high levels of greenhouse gas emissions and because anaerobic digesters are economically feasible for large operations, there is reason to consider the benefits that could be achieved by requiring these practices for large CAFOs in the Farm Bill.

Livestock management is a critical area for addressing climate impacts, and biogas has the potential to be a win-win for farmers willing to invest in alternative energy production.


The U.S. agricultural system must evolve to mitigate climate change and adapt to the effects of a changing climate. Opportunities for climate change mitigation and adaptation exist across the Farm Bill titles, from bolstering climate resilient infrastructure in the Rural Development title to incentivizing sustainable forest management in the Forestry Title. Taking action on climate measures in the next Farm Bill reauthorization will help farmers better plan for changing conditions, protect taxpayers from increasing risks, and assist the United States in meeting its global climate commitments. The next Farm Bill should incorporate climate risk management provisions, and state and local actors should consider ways to support these efforts.

[1] The first draft of this paper was written while the authors were enrolled in Harvard Law School’s Emmett Environmental Law and Policy Clinic, and a previous version was released by the Clinic in Fall 2017. The authors would like to acknowledge Clinical Professor and Director Wendy Jacobs and Senior Clinical Instructor Shaun Goho for their contributions and guidance throughout the project. Thanks also to the editorial staff of the Harvard Environmental Law Review for their help and advice. Any mistakes are the authors’ own.

[2] J.D., Harvard Law School, Class of 2017.

[3] M.P.P. Candidate, Harvard Kennedy School, Class of 2018.

[4] J.D. Candidate, Harvard Law School, Class of 2018.

[5] EPA, Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2015, at ES-21 (2017).

[6] Research Program on Climate Change, Agriculture, and Food Safety, Food Emissions (2016), https://perma.cc/YYL8-YSPM.

[7] EPA, Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990 – 2014, at 5-1 (2016) [hereinafter EPA, Inventory], https://perma.cc/HQ9B-BJYP.

[8] EPA, Overview of Greenhouse Gas Emissions [hereinafter EPA, Overview], https://perma.cc/7WS6-JXQY. The two to three percent of emissions unaccounted for are fluorinated gases, which are synthesized during industrial processes. Id.

[9] Natasha Gilbert, One-third of our Greenhouse Gas Emissions Come from Agriculture, Nature (Oct. 31, 2012), https://perma.cc/2GF7-ASMM.

[10] EPA, Inventory, supra note 7, at 5-1.

[11] Id.

[12] Id.

[13] Research Program on Climate Change, Agriculture, and Food Safety, Food Emissions (2016), https://perma.cc/YYL8-YSPM.

[14] See U.S. Dep’t of Agric., USDA Agriculture Climate Change Adaptation Plan 9 (2014) [hereinafter USDA, Adaptation Plan], https://perma.cc/8SM9-5NDX; Louise Jackson & Susan Ellsworth, Scope of Agricultural Adaptation in the United States: The Need for Agricultural Adaptation, in The State of Adaptation in the United States (2012), https://perma.cc/HS57-K35T.

[15] For example, a recent report from the Office of Management and Budget and the Council of Economic Advisers estimates that the annual cost of the crop insurance program will increase by $4 billion per year in 2080 as a result of the impacts of climate change. OMB & CEA, Climate Change: The Fiscal Risks Facing the Federal Government 6 (Nov. 2016), https://perma.cc/4Y22-P85V; see also USDA, Adaptation Plan, supra note 14, at 9.

[16] U.S. Dep’t of Agric., Climate Change and Agriculture in the United States: Effects and Adaptation 126–27 (2013) [hereinafter USDA, Effects and Adaptation], https://perma.cc/QW8T-Y4RL.

[17] M. McLeod et al., Cost-Effectiveness of Greenhouse Gas Mitigation Measures for Agriculture: A Literature Review, OECD Food, Agriculture and Fisheries Papers, No. 89, at 26 (2015).

[18] Peter Lehner & Nathan Rosenberg, Legal Pathways to Carbon-Neutral Agriculture, 47 Envtl. L. Rep. 10,845, 10,849 (2018).

[19] Id. at 19–21.

[20] For a more detailed review of how carbon sequestration can be increased in agriculture, see Daniel Kane, Nat’l Sustainable Agric. Coal., Carbon Sequestration Potential on Agricultural Lands: A Review of Current Science and Available Practices (2015), https://perma.cc/R4WA-2PPK.

[21] Adapted from P. Smith et al., Greenhouse Gas Mitigation in Agriculture, Philosophical Transactions of the Royal Society B, 363, 789–813 (2008).

[22] Alexandra Bot & José Benites, Food & Agric. Org. Of the United Nations, FAO Soils Bulletin 80, The Importance of Soil Organic Matter: Key to Drought-Resistant Soil and Sustained Food and Production 19 (2005), https://perma.cc/6VE8-6KG7.

[23] USDA, Effects and Adaptation, supra note 16, at 123; see also Nat’l Sustainable Agric. Coal., Climate Change and Agriculture Recommendations for Farm Bill Conservation Program Implementation 2 (2014), https://perma.cc/2JKC-AXSY.

[24] While these practices may generally lead to better resilience on farms, adaptation practices are highly region-specific.

[25] USDA, Effects and Adaptation, supra note 16, at 126–27 (2013).

[26] For example, in the Central Valley of California, an adaptation plan that included integrated changes in crop mix and altered irrigation, fertilization, and tillage practices, was found to be most effective for managing climate risk. Id. Along with the USDA Climate Hubs, the following organizations have undertaken projects related to regional agricultural adaptation research and planning: California Healthy Soils Initiative; Wisconsin Initiative on Climate Change Impacts; Southeast Florida Regional Climate Change Compact; The Mid-Atlantic Water Program; U.S. Midwest Field Research Network for Climate Adaptation.

[27] Id. at 126.

[28] Id.

[29] See COMET-Farm, https://perma.cc/4GR3-DHJH.

[30] U.S. Dep’t of Agric., About the Risk Management Agency, https://perma.cc/N49E-KQ3H.

[31] Dennis A. Shields, Cong. Research Serv., Crop Insurance Provisions in the 2014 Farm Bill 3 (2015).

[32] Id.

[33] Id.

[34] Dennis Shields, Cong. Research Serv., Federal Crop Insurance: Background 2 (2015).

[35] Cong. Budget Office, March 2016 Baseline for Farm Programs (2016), https://perma.cc/896T-TUJ9; see also Heritage Found., Addressing Risk in Agriculture (2016).

[36] U.S. Dep’t of Agric., Structure and Finances of U.S. Farms: Family Farm Report, 2014 Edition 32–33 (2014), https://perma.cc/S9YP-P6CY.

[37] Generally, the more diverse or specialized crops and livestock a farmer produces, the harder it is to obtain insurance. These policies are not designed to support small producers and the policies are administratively complex and burdensome for small farmers, with high premiums for small farmers. On the one hand, if small farmers used yield-based or revenue-based insurance policies, those farmers would need to purchase insurance for each crop, which requires producing a significant volume of each single crop to justify the paperwork and setting up a contracted purchase price from a processor. On the other hand, whole farm insurance policies base policies on average adjusted gross revenue of the farm, regardless of the variety of products the farmer grows. This type of policy is more appropriate for diversified farmers, but may still be too cumbersome for small farms to participate. See Jeff Schahczenski, Nat’l Sustainable Agric. Info. Serv., Crop Insurance Options for Specialty, Diversified, and Organic Farmers (2012), https://perma.cc/64P6-CTRC; Nat’l Sustainable Agric. Coal., Have Access Improvements to the Federal Crop Insurance Program Gone Far Enough?, NSAC’s Blog (July 28, 2016), https://perma.cc/PT37-RNNL.

[38] Shields, Federal Crop Insurance: Background, supra note 35, at 1.

[39] Linda Prokopy et al., Farmers and Climate Change: A Cross-National Comparison of Beliefs and Risk Perceptions in High-Income Countries, 56 Envtl. Mgmt. 492, 497 (2015).

[40] Bruce Babcock, Environmental Working Group, Cutting Waste in the Crop Insurance Program 10 (2013).

[41] Id.

[42] C. O’Connor, NRDC Issue Paper 13-04-A, Soil Matters: How the Federal Crop Insurance Program Could Be Reformed to Encourage Low-risk Farming Methods with High-reward Environmental Outcomes (2013).

[43] See, e.g., Heritage Found., Addressing Risk in Agriculture (2016).

[44] NSAC, 10 Ways USDA Can Address Climate Change in 2016, NSAC’s Blog (Dec. 30, 2015), https://perma.cc/L5AZ-NAF5.

[45] See Practical Farmers of Iowa, Cover Crops, https://perma.cc/7GHL-NVXQ.

[46] USDA’s Economic Research Service found that “[l]ands brought into or retained in cultivation due to these crop insurance subsidy increases are, on average, less productive, more vulnerable to erosion […] then cultivated cropland overall. Based on nutrient application data, these lands are also associated with higher levels of potential nutrient losses per acre.” USDA Economic Research Service, Report Summary: Environmental Effects of Agricultural Land Use Change (Aug. 2006); see also Daniel Sumner and Carl Zulauf, The Conservation Crossroads in Agriculture: Insight from Leading Economists. Economic and Environmental Effects of Agricultural Insurance Programs, The Council on Food, Agricultural and Resource Economics (2012).

[47] See Stephanie Ogburn, The Dark Side of Nitrogen, Grist (Feb. 5, 2010), https://perma.cc/9J6E-ZD9J (“About one percent of the world’s annual energy consumption is used to produce ammonia, most of which becomes nitrogen fertilizer.”).

[48] See, e.g., Anne Weir and Craig Cox, Envtl. Working Grp., Crop Insurance: An Annual Disaster (2015).

[49] Sodbuster, 16 U.S.C. § 3811 et seq.; Swampbuster, 16 U.S.C. § 3821 et seq.

[50] See Nat. Res. Conservation Serv., U.S. Dep’t of Agric., Conservation Compliance Provisions, https://perma.cc/6V9X-URBP.

[51] Id. at 7.

[52] O’Connor, Soil Matters, supra note 43, at 7.

[53] U.S. Dep’t of Agric. Climate Hubs, Mission and Vision, https://perma.cc/T46E-CSBT.

[54] Id.

[55] The existing ARS LTAR system, which conducts longterm sustainability research, could be used to inform the regional best practices communicated in outreach efforts. See Agric. Research Serv., U.S. Dep’t of Agric., Long-Term Agroecosystem Research (LTAR) Network, https://perma.cc/6XRT-FBTC.

[56] For example, manure management practices can create a public nuisance for which neighbors have little recourse. In addition, runoff from agriculture is not adequately regulated under the Clean Water Act and results in pollution to the nation’s waterways. Every year a hypoxic zone, also called a dead zone, develops where the Mississippi River dumps pollution from Midwest livestock and fertilizers into the Gulf of Mexico. See Kyle Weldon & Elizabeth Rumley, Nat’l Agric. L. Ctr., States’ Right to Farm Statutes, https://perma.cc/Y8XA-KUBR; Ada Carr, This Year’s Gulf of Mexico “Dead Zone” Will Be the Size of Connecticut, Researchers Say, Weather.com (Jun. 15, 2016), https://perma.cc/36ZZ-NKY9.

[57] Farms where the cattle range freely do not release as much methane to the atmosphere because the less consolidated manure is more likely to be absorbed into the soil rather than anaerobically digested to produce methane.

[58] Using poultry manure as a substrate can be difficult because feathers and poultry litter can clog anaerobic digesters. See Donald L. Van Dyne & J. Alan Weber, Special Article, Biogas Production from Animal Manures: What Is the Potential?, Industrial Uses/IUS-4 20, 22 (Dec. 1994).

[59] SustainGas, Sustainable Biogas Production: A Handbook for Organic Farmers 38 (2013), https://perma.cc/8354-G3A4.

[60] Digestate is the solid that is left over after biogas has been produced. Digestate can be sold or used on farm as fertilizer. It smells better than manure, is free of harmful bacteria, and contains nitrogen in a form that is more bioavailable for crops.

[61] 40 organic farms in Germany, in a region without livestock, have found it worthwhile to cooperate in supplying and transporting clover grass up to 50 km to an AD because the digestate provides them with a flexible organic fertilizer. See SustainGas, supra note 60, at 28. They find that the digestate leads to higher quality for their food crops. Id. “Biogas has to serve food production via improved nutrient supply,” one farmer says. Id.

[62] If farmers can show that they have reduced their methane emissions, they may be able to sell the carbon offsets in exchanges such as the California GHG cap and trade market. See Cal. Air Resources Bd., Compliance Offset Protocol, Livestock Projects: Capturing and Destroying Methane from Manure Management Systems (2014), https://perma.cc/68EF-2SB9.

[63] The odor-reducing benefits are viewed as especially desirable for poultry and swine farms.

[64] Biogas plants dispose of waste and sewage, making conditions healthier. Not only does the anaerobic digestion process remove pathogens, but because biogas production requires collecting manure at a central location, some unhygienic conditions are avoided. See Julia Bramley, et al., Tufts Department of Urban & Environmental Policy & Planning, Agricultural Biogas in the United States: A Market Assessment 122 (2011), https://perma.cc/Z4ER-S4SD.

[65] Livestock manure generated at cattle yards and dairy farms can contaminate surface and ground water through runoff. Anaerobic digestion sanitizes the manure to a large extent, decreasing the risk of water contamination. Id.

[66] EPA, AgSTAR Handbook: A Manual for Developing Biogas Systems at Commercial Farms in the United States, 2d. ed. 2-5 (K.F. Roos et al. eds. Feb. 2004).

[67] Id. at. 3-1. For most farms, electricity comprises 70% to 100% of energy use. Id.

[68] U.S. Dep’t of Agric., Rural Energy for America Program Renewable Energy Systems & Energy Efficiency Improvement Loans & Grants, https://perma.cc/5LE3-2QRF.

[69] This model is frequently used for wind energy production. See Agric. Research Serv., U.S. Dep’t of Agric., Wind and Sun and Farm-Based Energy Sources, Agric. Res., Aug. 2006, https://perma.cc/ZBJ9-R74Q.