Actor Leonardo DiCaprio is officially the world’s greenest male celebrity, beating Bono, Brad Pitt and actor Ed Begley Jr to the title, while chat-show host oprah Winfrey picked up the female prize ahead of contenders Angelina Jolie, Hayden Panettiere, Gwyneth Paltrow and Sir Paul McCartney’s ex-wife Heather oills. The results come from a survey conducted by GreenDaily.com and Bebo.com in honour of Earth Day.The least eco-friendly stars were Mariah Carey, who is reported to regularly fly her personal trainer out from the Carribean for work out sessions, and qualified pilot John Travolta who has clocked up many hours in the air.