He's paid his dues, time after time

Who are you, Brian May? - Times Online

...Most of my most knowledgeable scientist friends don’t believe that global warming exists. I have still not seen any proof that the planet is increasing in temperature, or that we have a hand in determining such changes. I do think the concept has led to some good changes, such as an increased awareness of how wasteful we are. But lots of people are cashing in on the carbon industry, distracting us from more important issues, such as how to treat animals.

Brian May: Information from Answers.com

Brian Harold May, CBE (born 19 July 1947) is an English musician and astrophysicist most widely known as the lead guitarist of the rock band Queen.
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May earned a PhD  in astrophysics in 2007 and is currently the chancellor  of Liverpool John Moores University.
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Shortly after graduating from college with an honors degree in physics and math, May focused full-time on music when Smile signed to Mercury Records.