The renewable fuel standard (RFS) mandates that a portion of the fuel supply be composed of an alternative fuel, in this case advanced biofuels (similar to the RFS included in the US Energy Independence and Security Act of 2007, which gradually phases in biofuels over 15 years).

FORBES: A Gas Tax Is Much, Much, More Efficient Than The CAFE Standards So Why Have We The CAFE Standards?

This dimension of security will be achieved by us when we have energy independence and when both of us act effectively for stability and peace in different regions of the world.

WHITEHOUSE: President Obama and Prime Minister Tusk Press Conference