While we're cursing the prices at the pumps ... scientists are searching for alternatives. And grass is not just greener, it could be powering your car someday.

In Brazil, nine out of ten cars run on sugar cane ethanol.  Here in the US, corn-based ethanol is more of a supplement but, technological leaps are making it possible to break down farm leftovers like corn stalks, grass, weeds and wood to be used as fuel. 

Oil giants like Shell are dipping their toe into the biofuel pool and so is Exxon, which hopes to one day make gasoline from algae.

Meanwhile, scientists continue the search for green fuels that make sense and save money.