Biofuels: No Silver Bullet

Scrutiny over biofuels is intensifying as it becomes clear that they are not the cure-all for curbing greenhouse gas (GHG) emissions and diversifying energy supply, as this week’s cover story shows (p. 18). A full accounting of the carbon impact of biofuels shows that they may actually generate more GHG emissions than petroleum-based fuels, according to recent studies. As it turns out, the amount of land clearing needed to support a global market for biofuels would drive GHG emissions dramatically higher than previously thought. The studies confirm the...

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