John Travolta has spoken out against global warming - despite being a passionate pilot and owning five jets.

According to the Daily Mail, the Wild Hogs star spoke about the importance of using "alternative methods of fuel".

The actor, a Scientologist, also suggested that the solutions could be found in outer space. He said: "It [global warming] is a very valid issue. I'm wondering if we need to think about other planets and dome cities."

He then defended his own actions, saying "I'm probably not the best candidate to ask about global warming because I fly jets. I use them as a business tool though."