8. Cameron Diaz
If ever there was a nature-loving traveler we’d like to get on a bus with, it’s Cameron Diaz. This eco-tourist extraordinaire uses offsets for carbon neutral travel, drives a Prius (don’t all enviro-celebs?) and had a show called "Trippin'" where she would go gallivanting around the world and show us how to enjoy the splendors of the world without killing baby penguins in Antarctica in the process. More recently, Diaz hopped on the Gore-wagon and has championed raising awareness about global warming. What an angel!