Blanchett, who helped launch the Australian Conservation Foundation's Who On Earth Cares campaign to reduce greenhouse pollution and avoid dangerous climate change, filmed a special appeal for SolarAid that was screened at the Hay Festival of Literature and Arts in Wales. The fan of eco-friendly jeans by Edun has also taken steps to reduce her carbon emissions by converting her Sydney home to a green one, timing her showers (and using a water-efficient shower head), and driving and flying less. (She has been seen riding eco taxis and buses.)
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Sienna Miller
A supporter of sustainable, fair-trade clothing, Miller owns a carbon-neutral clothing line, Twenty8Twelve. The Environmental Media Association (EMA) Futures Award winner also promotes and raises awareness of carbon emissions as an ambassador for UK-based Global Cool, a campaign to address global warming.
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Hayden Panettiere
The "Heroes" star and campaign spokesperson for Save the Whales Again made headlines when she protested with a group of surfers to stop local fisherman from killing pilot whales in southwestern Japan. Her efforts garnered her the Wyler Prize at the 2008 Genesis Awards by the Humane Society of the United States (as well as an arrest warrant in Japan). She also supports the World Wildlife Fund (WWF), a global conservation organization.
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Alicia Silverstone
The vegan actress, who generated a lot of attention for People for the Ethical Treatment of Animals (PETA) by posing nude in a racy ad for vegetarianism, lives in an eco-friendly house, doesn't wear animal products and only buys goods from companies that never test on animals. In addition to setting up a rescued-pet sanctuary in Los Angeles, she's a supporter of PETA's Save the Sheep and Cows are Cool campaigns.
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Angelina Jolie
In addition to being Goodwill Ambassador for the Office of the UN High Commissioner for Refugees (UNHCR), Jolie helped musician Wyclef Jean with Project Clean Streets, an initiative to collect garbage on a regular basis in six municipalities in metropolitan Port-au-Prince, Haiti. She also donated millions of dollars toward a wildlife sanctuary in the northwestern province of Battambang in Cambodia.
If Cameron and Gwyneth do it, will you do it too? Yes, celebs have millions
of dollars at their disposal (to offset those travel emissions, for one) but
many of these green beauties show that it doesn't always take a lot of dough
to put in a little effort. Find out which celebrity activists are making
green more than just a trend with inspiring eco-friendly choices, from the
clothes they wear to the causes they support.