The "Stardust" actress - who became an ambassador for Global Cool this year, an organization committed to educating the public about the harmful effects of global warming - has been honored with the Environmental Media Association (EMA) Futures Award.

Sienna will be presented with her prize at the 17th annual EMA awards ceremony, which airs on entertainment news channel E! on November 7.

The 25-year-old actress traveled to India in July this year to help publicize the Global Cool campaign.

She said: "We need to understand that we have to stand together and work together to conserve the bounty of nature."

"Hence, it is my sincere request to my friends, fans and citizens of India to do their bit to keep global warming from harming this beautiful country."

The EMA ceremony will also be attended by former US Vice President Al Gore who will collect the Outstanding Achievement Award.

Trudie Styler, Sting's wife, has won the EMA Lifetime Achievement Award.

Rockers Incubus will receive the Pepsi Mission in Music Award and penguin animation "Happy Feet" has been named Best Feature Film for its "ecologically uplifting and informative message."