Episode Details

What is Carbon Farming?

Carbon farming refers to a wide range of agricultural practices that increase carbon sequestration in soil, vegetation, and forests. Conventional agricultural practices often release carbon, but traditional farming practices, permaculture, agroecology, regenerative, and organic farming practices can instead create carbon sinks. As plants photosynthesize, they remove carbon dioxide from the atmosphere and store carbon above ground and below ground (in roots) as biomass throughout their lifetime. Dead organic matter can store carbon in the soil for several decades. Carbon farming practices also sequester other potent greenhouse gasses such as methane and nitrous oxide which further helps mitigate climate change. 

Examples of carbon farming practices include using mulch, compost, and perennial crops in agricultural fields. As California ramps up its composting in response to goals set by 2016’s food waste bill SB-1383, using compost on farmland could have even more benefits. In addition to potentially increasing the carbon sequestered in soils, diverting compost to agriculture would also put all the extra compost to use. But many farmers are wary of using the new compost on their land, UC Staff Researcher Cole Smith told Civil Eats in 2022. Climate Break guest Ian Howell says building collaborative and voluntary carbon farming plans with farmers and ranchers can help overcome their hesitation.

Carbon farming goes beyond compost, and can encompass a variety of practices, many of which also offer water quality and productivity benefits. Returning leftover biomass after harvest to the soil instead of burning or disposing of the material also increases carbon sequestration. Replacing traditional tillage practices with conservation tillage or no-till farming can help reduce soil erosion. Planting cover crops in the off-season instead of leaving crop lands bare, and rotating crops and growing diverse crop rotations instead of monocultures all support soil health and carbon sequestration. 

Carbon Farming in California

The U.S. EPA reports that the agriculture sector accounts for 11% of U.S. greenhouse gas emissions, and land use and forestry account for 13%. In California the Healthy Soils Program pays farmers and ranchers to adopt policies that better sequester carbon, improve soil health, and reduce greenhouse gas emissions. The initiative began in 2017 and is funded by California Climate Investments (CCI) cap and trade program. The Healthy Soils Program has received $40.5 million from CCI which has helped fund over 600 projects across the state. Many Resource Conservation Districts – like the Alameda County Resource Conservation D