According to a new survey conducted to recognise Earth Day, DiCaprio and Winfrey were named as the celebrities who pay more attention to the environment than any others, reports Starpulse.com.
The poll was put together by GreenDaily.com and Bedo.com. DiCaprio topped the list of the most green male stars, followed by Bono, Brad Pitt and Ed Begley Jr.
For the women, Winfrey was ranked number one, followed by Angelina Jolie, Hayden Panettiere, Gwyneth Paltrow and Heather Mills.
Singer Mariah Carey was named as the least green female star, and John Travolta had the dishonour for the men.