Food loss and waste is estimated to be roughly one third of the food intended for human consumption in the United States. When food is discarded, all inputs used in producing, processing, transporting, preparing, and storing discarded food are also wasted. Food loss and waste also exacerbates the climate change crisis with its significant greenhouse gas (GHG) footprint. Production, transportation, and handling of food generate significant Carbon Dioxide (CO2) emissions and when food ends up in landfills, it generates methane, an even more potent greenhouse gas.
Source: Food Waste and its Links to Greenhouse Gases and Climate Change | USDA