Sir Paul McCartney is best known for his contribution to music, but he goes a long way past that to help with environmental issues. Sir Paul has hosted the PETA's Party of the century gala in honour of his late wife and for others who carried on her work to protect animals, performed on Band Aid and look part in Live Aid to help raise money for Africa, among other things.
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Leonardo Di Caprio is one of the biggest movie stars on the planet, away from the acting scene he uses his fame to promote worthy causes such as the Leonardo DiCaprio Foundation which was started in 1998 to help protect and restore balance to ecosystems that were under threat. He is also on the board of the WWF and the International Fund for Animal welfare among other things.