Money paid to offset greens’ sins by emission could go toward planting of genetically modified crops in China, if biotech company Arcadia Biosciences gets its way. Arcadia says its rice requires less nitrogen fertilizer, and farmers planting it should be rewarded with carbon credits for reducing their emissions of greenhouse gas nitrous oxide. The company has not yet convinced the Chinese government to allow farmers to sell genetically modified rice, nor swayed environmentalists skeptical of biotechnology.