Although the output of GHG in terms of grams is only 7% of US total, for food waste those grams would predominantly be methane and nitrous oxide, which have much higher warming potentials.

Ceasing the burning of fossil fuels would be significant. But stopping organic matter from decomposing in a landfill would also be significant — and it’s currently feasible and scalable.

https://cdn.ymaws.com/www.compostingcouncil.org/resource/res...