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In 2009, she publishedThe Kind Diet, an outline on the benefits of a plant-based diet.

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Alicia Silverstoneattending the Manhattan Theatre Club’s TIME STANDS STILL After Party at Planet Hollywood in New York City. January 28, 2010 © Walter McBride / Retna Ltd.

Add a veggie day to your diet once a month.

What can you do?

For just $10, you’re able to plant ten trees.

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Actor Emma Watson attends Burberry Prorsum’s spring 2010 runway show at Chelsea College of Art.

She recently started theC.A.T.S.–Checotah Animal, Town, and School–Foundation to benefit her Oklahoma hometown.

What can you do?

Adopt a pet!AdoptAPet.comhas over 6,000 rescued animals looking for homes.

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Singer Leona Lewis attends a party celebrating the 1 year anniversary of the 3.1 Phillip Lim LA boutique. The evening was hosted by Vogue.

Natalie Portman

**The actress was voted the top eco-friendly celeb in 2008 by green website Grist.org.

And, it saves you money on your electric bill.

How will you commemorate Earth Day?

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04 FEB 2010: Carrie Underwood speaks with media during the Super Bowl XLIV Pregame Show Press Conference for Super Bowl XLIV at Super Bowl Media Center in Fort Lauderdale, FL. © Icon/ SMI / Retna Ltd.** USA ONLY ****

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Natalie Portman attends Vanity Fair’s 16th annual Oscars party at the Sunset Tower Hotel.