Marin’s businesses will have to meet new goals for diverting organic waste from landfills after a statewide mandate took aim at greenhouse gas emissions. Organic waste decomposing in landfills is a significant source of methane, and the county’s new targets—75 percent of organics diverted from landfills and 20 percent of edible food saved from the garbage for human consumption by 2025—come from California’s Short-Lived Climate Pollutant Reduction Strategy, also known as Senate Bill 1383. “S.B.…