The U.S. Environmental Protection Agency has proposed new standards for how much of the nation's fuel supply should come from renewable sources.
The proposal, released last month, calls for an increase in the mandatory requirements set forth by the federal Renewable Fuel Standard, or RFS. The program, created in 2005, dictates how much renewable fuels — products like corn-based ethanol, manure-based biogas, and wood pellets — are used to reduce the use of petroleum-based transportation fuel, heating oil, or jet fuel and cut greenhouse gas emissions.
