From the New York Times:

Americans are still the undisputed champions of trash, dumping 4.6 pounds per person per day, according to the E.P.A.’s most recent figures. More than half of that ends up in landfills or is incinerated.

Food waste, which the E.P.A. says accounts for about 13 percent of total trash nationally — and much more when recyclables are factored out of the total — is viewed as the next big frontier.

When apple cores, stale bread and last week’s leftovers go to landfills, they do not return the nutrients they pulled from the soil while growing. What is more, when sealed in landfills without oxygen, organic materials release methane, a potent heat-trapping gas, as they decompose. If composted, however, the food can be broken down and returned to the earth as a nonchemical fertilizer with no methane by-product.