Ben Affleck
Sure, he plays Batman, but did you know he's kind of a superhero in real life too? The actor co-founded the Eastern Congo Initiative to help create environmentally friendly local trade.
Gwyneth Paltrow
The actress turned lifestyle guru has used her company, goop, to promote sustainable choices and products!
Ian Somerhalder
He may have played a villain on The Vampire Diaries, but in real life he's a do-gooder! The actor started his own eponymous foundation dedicated to tackling environmental issues.
Salma Hayek
The artist loved to use different colors in her work, but this Frida actress definitely has a favorite color - green! The actress is a member of the board of Global Green USA.
Pharrell Williams
We're so "Happy" about this singer's collaboration with the streetwear brand G-Star. All G-Star raw denim is made using recycled bottles, making it fashionable and functional.
Olivia Wilde
The House actress is the founder of Conscious Co., a website that connects users to eco-friendly products!
Mark Ruffalo
When he's not turning green as the Hulk, he's going green in real life! The actor is an outspoken environmentalist, especially when it comes to preventing fracking.
Bono
The U2 frontman has his own eco-friendly clothing line, Edun, which works to locally source goods in Africa.
Adrian Grenier
You want to be a part of his entourage? Then you'll have to go green! The Entourage actor is co-founder of SHFT, a website dedicated to sustainable products and ideas.
Drew Barrymore
This flower child has her own beauty line, and all of her products use natural and organic materials!
Mario Lopez
Mario Lopez has been known to lend a helping hand to Habitat for Humanity by building homes for Los Angeles families.
Hailee Steinfeld
Hailee Steinfeld recycled clothing during the opening of H&M at Sundance Square.
Ray Romano
Comedian Ray Romano always keeps us laughing and did so when he attended the Keep It Clean live Earth Day Comedy Benefit.
Miss Piggy
Miss Piggy has a soft side. The famous pig pitched in to build houses for Habitat for Humanity.
Nikki Reed
To celebrate Earth Day, Nikki Reed partnered with Kiehl's for a Earth Day 2016 Project Benefiting Recycle Across America.
Hayden Panettiere
The Nashville star joined a number of celebs for a campaign produced by Appeal to Reason for Americans Against Fracking, the Environmental Media Association, Food & Water Watch and Environment California to appeal to Golden State Gov. Jerry Brown to put an end to hydraulic fracturing—the controversial method of oil and gas extraction known as fracking.
Rosario Dawson
The Sin City starlet joined SodaStream to kick-off the inaugural Unbottle the World Day in NYC's Time Square. The cause works to combat environmental hazards caused by bottle and can waste.
Morena Baccarin
The Homeland actress visited the International Rescue Committee's Drew Garden community garden in The Bronx, N.Y. The IRC's New Roots campaign will enable newly arrived refugees across the United States to grow, harvest and market fresh, affordable and healthy food while planting roots in their new communities.
Kimberly Williams-Paisley
Brad Paisley's other half was all smiles in Haiti where she supported Live Beyond...Thirst, a nonprofit organization which helps provide clean water to households in the impoverished country.
Colin Firth
The beloved Oscar winner put the spotlight on the plight of the Awa tribe and its shrinking lands in the Amazon and urged people to get involved to help.
Malin Akerman
The actress, who is on the Environmental Media Association's Young Hollywood board, planted seeds at the Metropolitan High School garden as part of Earth Week.
Matt Damon
When Damon isn't on an action movie set, he's working to give the world one overlooked luxury: clean water. He launched a non-profit organization called Water.org, a group that aims to help poor communities around the world gain access to clean water.
Penélope Cruz
With the help of Global Green USA, Cruz and friends like Leonardo DiCaprio and Orlando Bloom have arranged for a fleet of alternative fuel vehicles to shuttle stars around for the Academy Awards since 2007.
Sting
The rocker and wife Trudie Styler created The Rainforest Foundation in 1989. Since then, the two have worked in the tropical rainforest regions of 15 countries, and have already protected more than 71,000 square miles of land in Brazil, Latin America, Africa, and Southeast Asia.