From sexy Leo's mega donation to tigers to Kevin Costner's surprise knowledge of oil clean-up technology, celebrities were on fire this year. There were a few mistakes, however....such as NBC's "Tonight Show" debacle, which sent a barely used set to landfill.
Here's a look back at the year in green hits and misses when it comes to Hollywood's A-listers.
Check out the rest of our Year in Review Series Here: The Most Popular and Memorable Stories of 2010
HIT: Leonardo DiCaprio and the WWFLeonardo DiCaprio
teamed up with the World Wildlife Fund
for this year's Save Tigers Now
campaign, which aims to double the number of endangered tigers in the wild by 2022 -- and capped off a year of involvement with a $1 million donation, saying, "By saving tigers, we can also protect some of our last remaining ancient forests and improve the lives of indigenous communities."
Photo: Jun Sato/WireImage/Getty Images