Country star Keith Urban is going green on his upcoming tour by running his tourbuses on biodiesel fuel and offering fans the chance to buy T-shirts made from recycled plastic bottles. The Aussie singer, who is married to actress Nicole Kidman, has teamed up with environmental T-shirt firm Chaser Merchandise to make sure the gear he's offering fans is as green as possible. He says, "While I am far from the greenest guy on the block, I do look for situations where I can make even a small difference. "And so the idea that our concert tees could retain the same look and feel, but be partly made from recycled materials appealed greatly to me."