Mother Jones: Want a quick recipe for reducing Arctic ice melt fast? Stop burning northern hemisphere farmlands and pasturelands. New research finds that large-scale agricultural burning in Russia, Kazakhstan, China, the US, Canada, and the Ukraine is melting Arctic ice. The big contributor: Spring burning, when farmers torch crop residues and brush to clear new land for crops and livestock. The black carbon soot produced by these fires flows north, warms the surrounding air, and absorbs …