To make all of the Greenies happy, just release a Chevy Volt version of the airplane.
Just power it on batteries.
Better yet, why not come up with a windmill powered aircraft?
Energy efficiency is a laudable objective, even if the ‘Global Warming’ agenda is not. Fuel is going to be a lot more expensive in years to come, and frankly, the last thing any of us should want is to have any more dependence on the Saudi Arabs than we absolutely have to have...
Great, we can call it the Chevy “Crash and Burn”. Or maybe the Chevy Fireball.
Will this do?
http://www.electraflyer.com/articles/Wired_Electraflyer-X_09.swf