Bills establishing credit programs for low carbon fuels, including those derived from landfills and other waste sources, are proliferating in state houses around the country.

A clean fuel, low carbon fuel, or clean transportation standard sets a timeline for fuel producers to gradually reduce the emissions, or carbon intensity, of their product, either by blending in existing low-carbon fuels like ethanol or buying credits from producers of fuels that emit even less carbon, like renewable natural gas derived from landfill gas or anaerobic digestion.