A great climate comes from happy soil. Could happy soil come from California?
(World News Science)

Fava beans growing in between grape vines at Granton Vineyard in southern Tasmania (Stefano Lubiana/Flickr/) The way we`re using our land isn`t helping our chances of limiting global warming. As last week`s IPCC report on land use and climate points out, agriculture, forestry, and other land uses are responsible for 22 percent of annual greenhouse gas emissions. But it doesn`t have to be like this. We need farms for food, of course. Normally, farms degrade and deplete their soils, which are an important sink for atmospheric carbon; the IPCC report states that regularly tilled fields lose soil at 100 times the rate they could possibly form new material. Switching the way we farm could change...