Cameron Diaz wants Shrek to be "A little greener"

Actress Cameron Diaz is hoping to turn the next Shrek movie all green - by asking producers to consider a film with an eco-friendly message.

The actress, who plays the ogre Princess "Fiona" in the Shrek films, has started her campaigning to make the fourth film all about the environment.

She says, "That's something I've been on producer Jeffrey's Katzenberg case about, that the swamp possibly could be in danger."

And Diaz has the backing of her animated mother in the Shrek films, Julie Andrews.

The movie legend [Julie Andrews] says, "What better way to get a message across than with something that's so funny?"