‘Carbon farming’ could make US agriculture truly green

There are a growing number of “carbon farmers” who are reducing planet-warming greenhouse gases by taking better care of the soil that sustains their farms. That means making changes like plowing fields less often, covering soil with composted mulch and year-round cover crops, and turning drainage ditches into rows of trees. Now Congress is considering legislation that would make these green practices eligible for a growing international carbon-trading marketplace that would also reward farmers with cash.