Very difficult and the current approach may not be good enough.
anip
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So far, so good. But once you dive down into the details of Joshi’s study, things get more complicated. The research found that the amount of carbon stored varied widely, depending on location, cover crop type, plowing, and the amount of plant growth. A different review, this time examining cover cropping on US farms, found that, in lots of cases, fields with cover crops didn’t gain extra soil carbon when compared to fields that hadn’t been cover cropped. “In terms of climate benefit, it isn’t all that great,” says West.
One of the big limitations to cover cropping is that carbon added to the soil might eventually make its way back into the atmosphere. “What we find is that even where there is a build-up of carbon, once you plow those areas again you lose a lot—or all—of the carbon that has been stored up over time,” says West. If money for cover crops runs out, farmers may start leaving fields bare during off-seasons and plowing them more, which would mean a lot of that sequestered carbon would end up back in the atmosphere. And if the cover crops reduce the overall productivity of fields, there’s also the danger that the practice might encourage more land to be converted to agriculture, which is bad news for overall emissions.
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