Colin Firth: The Green Carpet Challenge and yet ANOTHER great shot of Colin and Meryl Streep (ECOUTERRE)

As Tinseltown's biggest night unfurled, no less than six A-list celebrities proved that sustainability and glamor were far from mutually exclusive. From an Oscar-wielding "Iron Lady" to two of Britain's national treasures, here are the marquee names who turned the red carpet green at the 84th Academy Awards.

Read more, great pictures:  http://www.ecouterre.com/6-celebrities-who-wore-eco-fashion-to-the-2012-oscars/