7 of 20:
DiCaprio is an environmentalist who is particularly concerned with global warming.
According to People magazine, DiCaprio chaired Earth Day 2000, and went on to win a number of awards for environmental leadership. He can often be seen tooling around Hollywood in his hybrid Toyota Prius.
DiCaprio also produced and narrated the documentary 'The 11th Hour' to help raise awareness about the effect of human impact on the planet.
(Pictured: Leonardo DiCaprio appears in a photo from the 'Inception' premiere in Paris on July 10, 2010.)
( Photo / flickr.com/photos/ninha_lalala/)