rid of powering anything by coal and move to, you know, the wonders of sun and wind and other forms of clean energy. >> i wanted to ask you when air fuel. you mentioned it. a big part of your business at virgin is virgin airlines and air travel. according to berkeley researchers, air travel produces just over 3% of the average american household's emissions. and taking one cross-country round trip is equivalent to more than 10% of the average american's carbon footprint. it's contributing to the problem. as the owner of an airline, how do you try to adapt to a cleaner form of energy? >> in lots of ways. we pushed boeing and airbus to build planes of carbon fiber. we flew a carbon fiber plane around the world, non-stop, showing it could be done. and they have reacted by