San Francisco is leading the way in producing high-quality compost to fertilize regional crops. In one year, 105,000 tons of food scraps and yard trimmings – 404 tons each weekday – get turned into 20,000 tons of compost for 10,000 acres farmed by Bay area growers. About 2,000 restaurants, 2,080 large apartment buildings and 50,000 single-family homes have embraced the city’s environmentally friendly green bins. The scrap is turned into gold, a rich compost that boosts the region’s bounty of food while curbing carbon dioxide in the atmosphere.