Carbon farming refers to agricultural practices designed to remove carbon from the atmosphere and store it in soils and plants. By increasing carbon sequestration, carbon farming aims to reduce greenhouse gas (GHG) emissions while improving soil health and adaptability.

Human activities have increased GHG emissions—particularly carbon dioxide, the primary GHG emitted through human activity—intensifying the greenhouse effect and raising global temperatures.

Agriculture and land-use change are major drivers, and global food systems are responsible for about one-third of annual GHG emissions.

One of the agrifood system’s largest contributions to carbon emissions is soil organic carbon (SOC) loss. Soils have a tremendous capacity to store carbon and can function as either carbon sinks or carbon sources. “If soil is a bank account, soil organic carbon is the currency,” Rattan Lal, Distinguished University Professor of Soil Science at the Ohio State University and a Goodwill Ambassador for the Inter-American Institute for Cooperation on Agriculture, tells Food Tank.

But modern agricultural practices have caused soils to emit more carbon than they retain. Soil organic carbon levels hover between 0.05 percent and 0.10 percent, well under the roughly 2 percent threshold that Lal identifies as necessary to sustain healthy, productive soils.

Converting forests or grasslands to farmland, and practices like over tillage, monocropping, heavy machinery use, overgrazing, and removing crop residues disturb soil structure, expose SOC to water and oxygen, and lead to SOC loss. Lower SOC levels weaken soil structure and diminish microbial activity and biodiversity.

Over the past 12,000 years and particularly in the last two centuries, agriculture has released about 133 billion metric tons of carbon dioxide from soils, and in some areas, soils have lost up to 70 percent of their original SOC. Soils emit around ten times more carbon dioxide than fossil fuels.

Because of their capacity to store carbon, soils also have significant potential to help mitigate climate change. Research suggests that improved land management could enable croplands to sequester up to 1.85 gigatons of carbon per year, roughly equivalent to the annual emissions of the global transportation sector.

Read the full article about carbon farming by Jessica Levy at Food Tank.