Waste-based biofuels make MA’s grade
The 2008 Massachusetts Clean Energy Biofuels Act requires petroleum suppliers in that state to make 2 to 3 percent of their sales, by volume, from biofuels by 2011. And in a recent decision, the state says that waste-based biofuels are the only ones yet to meet the state’s renewable fuel standards, citing their significantly reduced contribution to greenhouse gas emissions. Waste-based biofuels comes from municipal solid waste, agricultural residues and farm waste; other biofuel sources like agricultural crops and algae have life-cycle impacts to greenhouse emissions that are not yet fully understood by scientists and require further analysis.
(via Scientific American)
