From the Document: "Agriculture and land-use activities have played a central role in the broader debate on energy and climate policy options in the U.S. and abroad. Although most federal legislative proposals to reduce net U.S. greenhouse gas (GHG) emissions would not require reductions in the agriculture sector, some would incentivize voluntary actions. [...] Agriculture is both a 'source' and a 'sink' of GHGs (Figure 1). Sources generate GHG emissions that are released into the atmosphere and contribute to global climate change. Sinks remove carbon dioxide (CO2) from the atmosphere and sequester carbon through physical or biological processes. Agricultural emissions include many GHGs of interest to policymakers: CO2, methane (CH4), and nitrous oxide (N2O)."
CRS In Focus, IF11404
Congressional Research Service: https://crsreports.congress.gov/