So here are a few :
Natalie has been advocating environmental preservation for almost her entire life.She is a regular supporter for PETA; she has been vegetarian since her childhood. As a young girl, she joined an environmental song and dance group, World Patrol Kids. In 2004 and 2005, she traveled to Uganda, Guatemala, and Ecuador as the Ambassador of Hope for FINCA International, an organization that promotes micro-lending to help finance women-owned businesses in poor countries (increased education and decreased poverty leads to a better understanding and concern for environmental awareness).She also worked on a campaign to help save the tropical habitat of African mountain gorillas. After taking part in these numerous campaigns, Portman released her own line of vegan footwear in the Spring of 2008.
Jolie is on the board of advisors for the Yéle Haiti Foundation, and with husband, Brad Pitt she helped Wyclef Jean with his Clean Streets project. Jolie also arranged a deal with People Magazine allowing them to print the first picture showing her visibly pregnant in exchange for a $500,000 donation to the charity.
Diaz participated at Live Earth in New York on July 7, 2007. She is also a member of thePangea Day advisory board, an organization dedicated to creating a worldwide network of concerned citizens who are making a difference and believe that film can change the world. She also supports Centre For Environmental Education, Environmental Media Association and Green Treks.