Ethanol: See here what Dickie Branson says about it:
http://msnbc.msn.com/id/10066397/
Virgin Airways eyes ethanol Most of the discussion I see on alternative fuel source focuses on cars, but I've long wondered what's going to happen with the airlines. At least one of them is taking an aggressive look at alternative fuel sources, hoping to replace "some or all" of the 700 million gallons of fuel it currently uses each year with ethanol.
Tired of skyrocketing jet fuel prices, Virgin Atlantic Airways boss Richard Branson said on Wednesday he plans to turn his back on hydrocarbons and use plant waste to power his fleet.
“We are looking for alternative fuel sources. We are going to start building cellulosic ethanol plants (to make) fuel that is derived from the waste product of the plant,” he told Reuters in an interview in the oil-rich United Arab Emirates.
“It is 100 percent environmentally friendly and I believe it’s the future of fuel, and over the next 20 or 30 years I think it actually will replace the conventional fuel that you get out of the ground.”
By the way you can make ethanol from cellulose (trees, plants etc.)