A golden oldie.
snips:
Farmers have released huge amounts of carbon dioxide, the major greenhouse gas, just by plowing their fields. The best way to raise a big carbon crop, though, is to do what Russell Hughes did on part of his farm in Searsboro, Iowa. He stopped growing corn and soybeans on part of his farm and turned it into pasture for cattle. Grass and clover covers this ground year-round; the roots grow deep.
"That reflects the past century of plowing and such. We've seen the organic carbon content of the field go from 5 percent to about 3 percent."
It may not seem like much, but it means that over the past 100 years, every acre of this field has vented about 50 tons of carbon dioxide into the atmosphere. That's about as much as eight average cars pump out in a year.
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