Livia Firth's Green Carpet Challenge kicked off its fourth year with the surprise recruitment of actor Bradley Cooper to wear a sustainable design to the 2013 Golden Globe Awards. 

The 38-year-old "Silver Linings" star donned a two piece "eco-tux" by Tom Ford made from OEKO-TEX® certified, low environmental impact, European spun and woven wool suiting. Cooper joins such notables as Javier Bardem, Colin Firth, Kenneth Branagh and Demian Bichir who have all gone green on the red carpet. 

"One of the names we are proudest of working with is Tom Ford," writes Firth on her Eco-Age site, "something of a mentor to us in our quest to merge ethics with aesthetics; he really ‘gets it’. He will never compromise and that’s what we love about him. It’s a sure-fire way of making sustainability raise its game."

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Since starting the Green Carpet Challenge, Firth has inspired fashion houses from Stella McCartney to Valentino, Gucci, and Chanel to consider alternative materials and increase their use of ethical and sustainable manufacturing. "A designer will create a gown for an actress anyway. So what we do is to work with the designers to switch the fabric to eco-alternatives," Firth told CNN last year

With the Globes now behind us, attention will now shift to the Oscars - with Firth likely to have more celebrities showing off gorgeous sustainable designs. Last year, Meryl Streep was the surprise big name in a green Lanvin gown. The Green Carpet Challenge was further elevated when the 63-year-old won the Best Actress award for her role in "The Iron Lady."

Check out Cooper's green turn on the Golden Globes Red Carpet below. 

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