Put a Tigger in Your Tank

California will begin labeling motor fuels according to their carbon output. While the formula for determining carbon output is not yet public, it will reportedly account for life cycle inputs; so, in the case of biofuels, to take an obvious example, the calculation will factor in the fertilizers and fuel used to grow the feedstock. The development is part of a larger plan in California aimed at cutting carbon from motor fuels by 10 percent as of 2020. Beginning in 2010, by current timetables, producers of low carbon fuels could earn credits which they could sell to companies that don't comply with new carbon caps.