Washington, DC — Composting reduces waste and builds healthy soil to support local food production and protect against the impacts of extreme weather, from droughts to heavy rainfall. That’s the message of two new reports from the Institute for Local Self-Reliance (ILSR): State of Composting in the U.S.: What, Why, Where & How and Growing Local Fertility: A Guide to Community Composting.
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CONTACT: Rebecca Toews
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Compost is the dark, crumbly, earthy-smelling material produced by the managed decomposition of organic materials such as yard trimmings and food scraps. Compost is valued for its ability to enhance soil structure and quality. It adds organic matter to soil, improves plant growth and water retention, cuts chemical fertilizer use, and stems stormwater run-off and soil erosion. In the U.S., 99 million acres (28% of all cropland) are eroding above soil tolerance rates, meaning the long-term productivity of the soil to support plant growth cannot be maintained.
“Applying a meager half-inch of compost to the 99 million acres of severely eroded cropland would require about 3 billion tons of compost,” says Brenda Platt, the lead author of both reports and director of ILSR’s Composting Makes $en$e Project. “There is not enough compost to meet that need. No organic scrap should be wasted.”
Compost also protects the climate: it sequesters carbon in soil and it reduces methane emissions from landfills by cutting the amount of biodegradable materials disposed. (Methane is a greenhouse gas with a global warming potential 72 times more potent than CO2 in the short-term.) A growing body of evidence demonstrates the effectiveness of compost to store carbon in soil for a wide range of soil types and land uses.
Yard trimmings composting programs are fairly well developed in the U.S. Of the 4,914 composting operations identified in the U.S. for State of Composting in the U.S., about 71% compost only yard trimmings (based on 44 states reporting). Food scrap recovery is slowly growing. More than 180 US cities and counties are now collecting residential food scraps for composting, up from only a handful a few years ago.
“There is more demand for composting, especially from businesses and institutions that want to source separate food scraps and not throw them in the landfill,” says Nora Goldstein, Editor of BioCycle, which conducted the state-by-state assessment of composting infrastructure and policies, “We not only need more infrastructure to compost these materials, we need more infrastructure to manufacture high quality compost that our soils — and climate — desperately need.” Continue reading
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