Ludacris and Tommy Lee at The Premiere of Discovery Communication's 'Planet Green' - Concert at the Greek Theatre - Arrivals. Los Angeles, California - 28.05.08

The two stars spent months visiting eco-warriors throughout the U.S. in a bid to live greener lives and the experience has had a huge effect on the drummer.

As well as planting an eco-friendly new lawn outside his California home, Lee is teaching his sons to be more resourceful.

He explains, "I'll tell my kids, `You guys have got to turn the lights off.'

"I've put motion detectors in their rooms so when they're not in there, the lights go off."

Source: WENN