Malaysia News.Net: Biochar, a material used by Amazonian Indians to enhance soil fertility centuries ago, may help slow global warming. Mass production of biochar could capture carbon that otherwise would wind up in the atmosphere as carbon dioxide, the main greenhouse gas leading to global warming. Kelli Roberts and colleagues of the College of Agriculture and Life Sciences, Cornell University, note that biochar is charcoal produced by heating wood, grass, cornstalks or other organic matter in …