Leonardo DiCaprio made waves at the Oscars this year when he used his acceptance speech as a chance to talk about climate change.
But he's not the only movie star that wants us to help the environment. Here are 7 other actors and one director that have spoken up about saving the planet.
1. Cate Blanchett
Cate Blanchett caused a stir in her native Australia when she appeared in this commercial, encouraging Aussies to vote for a tax on carbon emissions.
2. Pierce Brosnan
The James Bond star has spoken out against the Zimbabwe government's capture and sale of baby elephants, and campaigned with the NRDC to try and stop the navy from doing explosive sonar testing in whale habitats.
3. Cameron Diaz
This Charlie's Angel has always been vocal about her green lifestyle. She worked with Al Gore on his "Live Earth" series, spreading the word about global warming and protecting our world. In an interview with Marianne Schnall, she voices some of her views about the green movement:
I feel like in the past the environmental movement has been sort of righteous and self-righteous that we have to do everything right. Well, at this point all you have to do is part of it right and it will help. If everybody just did one step collectively, it does make a difference. That's the point. There's a lot of us on this planet. There's a lot of us in this country and if even just - we are the biggest emitter of emissions - that is the fact. China and us. We are happily spewing into the atmosphere. Fine. You know what - we are going to continue to do so until it completely changes, but if you can do anything to take that back and minimize it, then why not?
4. James Cameron
It's no secret that the Avatar director wants us to be more respectful of the planet. In an radio interview about the film, he said,
“I wanted to do a film that had a deeply embedded environmental message … but do it in the form of a science fiction action adventure. My feeling was if we have to go four light years away to another planet to appreciate what we have here on earth, that’s okay.”
Cameron also directs the National Geographic investigative environmental series, Years Of Living Dangerously.
5. Harrison Ford
Han Solo/Indiana Jones is a man of many accomplishments, a lot of which include environmental work. He's been involved with Conservation International and E.O. Wilson Biodiversity Foundation, and was a correspondent in James Cameron's Years Of Living Dangerously. In an interview with National Geographic, he said,
"I believe that it's the future of conservation in general. One of the tenets of [Conservation International] has always been to offer economic opportunities in developing countries, where providing for people's basic needs puts a lot of pressure on the environment. By adopting better practices, international corporations can be very important partners in protecting nature. "
6. Daryl Hannah
The Kill Bill actress gained national attention when she chained herself to a walnut tree in 2006. Since then, she runs a successful environmentalist blog, dhlovelife, and she's the founder of the Sustainable Biodiesel Alliance. She and Michael Brune wrote this powerful op-ed for the Guardian, encouraging President Obama to reject the Keystone XL pipeline.
"We know what we need to do: stop using fossil fuels. And we know how we can do it: by refusing to subsidize fossil fuels and by increasing our investment in renewables and energy efficiency."
7. Don Cheadle
Hotel Rwanda and Ocean's Eleven actor Don Cheadle is a global ambassador for the United Nations Environment Programme, and another correspondent for Years Of Living Dangerously. He says this about his work:
“I hope to use my "celebrity" to motivate people and contribute to moving our global society back from the brink. I am surprised environment is not at the top of the agenda. What is more important than food and clean air? We need a big push.”
8. Mark Ruffalo
Mark Ruffalo isn't only green when he's playing the Hulk in The Avengers. He's been an environmental activist for years, working with The Solutions Project, writing articles and even calling out David Cameron for his controversial decision on fracking.