When you think of steps that can be taken to improve our environment and mitigate climate change, "reducing food waste" probably doesn't come to mind right away. But in fact, food waste is an important factor in climate change, because wasted food represents 20 percent by weight of the solid waste going to landfills. This decomposing food quickly generates methane, a greenhouse gas 21 percent more potent than carbon dioxide.
Wasted food also represents a drain on natural resources–after all, land and water are needed to produce that food. That's why the U.S. Department of Agriculture has collaborated with the U.S. Environmental Protection Agency to launch the U.S. Food Waste Challenge, calling on producer groups and others to join in efforts to reduce food loss and waste, recover wholesome food for human consumption, and recycle discarded food to feed animals, produce compost or even generate energy.