Thandie NewtonThandie Newton has revealed she’s trying to convince to go green but she’s not had much luck so far.

She sent letters to stars such as Madonna, Michael Jackson, Tom Cruise, Chris Martin & Gwyneth Paltrow, Robin Williams, the Osbournes and the Beckhams but “I didn’t get one letter back.”

“I wasn’t judgemental. It was like, ‘In case you didn’t know here are some facts about the environment and some reasons why it turns out 4×4s aren’t that great to have in the city.’

But she’ll keep trying with her efforts: “I was staying with Oprah recently and I suggested that she switches her whole fleet of cars. I really hope she does. It would do so much good.”