MATT DAMON is trying to save the planet with an organisation attempting to halt the tons of junk mail delivered to American homes.
The movie star has joined forces with website GreenDimes.com in an effort to promote environmental efforts to prevent the trees used for junk mail letters and envelopes from being chopped down.
He says, "For an estimated dime a day they can stop 70 per cent of the junk mail that comes to your house.
"It's very simple, easy to do, great gift to give, I've actually signed up my entire family. It was a gift given to me this past holiday season and I was so impressed that I'm now on the board of the company." The GreenDimes.com organisation also plants a tree for every member.