Considering that one third of household waste is organic, composting makes sense in terms of waste reduction as it diverts significant amounts of trash from landfill. Organic waste in landfills generates methane, a potent greenhouse gas. Landfills are the third-largest source of human-related methane emissions in the United States. By composting food scraps and other organics, methane emissions are significantly reduced and instead become a plant food.
Landfill is not a big compost pile. The landfill does not receive the proper balance of moisture, nutrients, and temperature to biodegrade organic matter. No one chops garbage in a landfill or stirs it, and no one adds fluids or oxygen- it is stable. These are not rare cases in landfills: Newspapers are still readable after almost 40 years; ten-year-old carrots are brown on the outside but bright orange on the inside; and 20-year-old steaks still have meat on the bones.