2 words. Algae oil.
No. Two more important words: Free Markets.
Those environmentally sound innovations that CAN MAKE IT ON THEIR OWN without gub'ment tax exemptions and (massive) subsidies, will be the real technology which moves us forward.
Check out the innovations in diesel car engines just in the last 20 years for example--NOT from giant subsidies, rather from consumers desiring efficient, powerful, inexpensive and clean-burning transportation.
If you haven't driven a diesel car lately (mostly German brands) you should....they are difficult to tell in driveability from gasoline cars...and tend to get over 40 mpg too.