I used to be skeptical of global warming, but now I'm absolutely convinced that the world is spiraling out of control. CO2 is like a bushfire that gets bigger and bigger every year.

All of us who are in a position to do something about it must do something about it. Because Virgin is involved with planes and trains, we have even more responsibility. So we've put aside quite a lot of money to invest in alternative fuels.

Over four years, we'll invest something like $1 billion in alternative fuels. The money is going into a whole series of different things like building ethanol plants. We're looking into wind power. We're looking into solar. And we're also actually working on developing a new kind of fuel. It will be called Virgin Fuel.

It's not ethanol-based as such, but it'll be a clean fuel. And if we've got it right, it could be a very important breakthrough.

We think this fuel will work in cars and trucks and trains. And we're hoping that it might work in commercial jet engines. So it will be able to work in Virgin Atlantic planes one day.

But it's not just that we thought we should do this to try to save the world and the thousands of species that could die if we don't do it. Unless you can generate cash, it's not going to be successful. We have talked to every scientist developing clean fuels.