Bloomberg ordered a pact projecting that by the year 2012 all New York limousines will run on fuel efficient engines.

“The plans would require the city’s so-called black cars to meet fuel efficiency standards of 9.4 liters per 100 kilometers (25 miles per gallon) in 2009 and 7.8 l/100 km (30 mpg) in 2010.” - Google News

He plans to upgrade New York limo fleet to partially battery powered engines, which work on electricity and gas.

Virgin Atlantic, the mega empire of self made British billionaire has also announced it will run it’s airport limousines on hydrogen fuel-cell engines. Virgin Atlantic also flew the first biofuel Boeing 747.

So far the change to green power has been largely blocked by mega oil corporate forces and is headed to the mix of oil+electricity in order to keep the oil in the game.

Over the last decade an enormous number of cheap, green and efficient fuel sources were developed, some of which include hemp, water(that’s right water) and numerous plants.

You can see a fully functional water engine over here. Other inventors developed water engines in Fillipines and Britain(you can Google it).