In the coming years, Marin County is expected to generate about 250,000 tons of biomass annually—the organic material from forest thinning, defensible space clearing, agriculture, yard work and food scraps. Much of it is destined for landfills, where it slowly releases greenhouse gases into the atmosphere, or is trucked across the state to the Central Valley to be burned for fuel or processed in faraway composting facilities.
A new study says that with a…