People build snowmen on a ground near the Berlin Cathedral (Berliner Dom) as part of a climate change awareness action in Berlin January 23, 2010. Environmental activists are calling on Berliners this weekend to build their own snowman in a bid to form a "Snowman Demonstration" in the heart of the German capital to raise awareness for climate change. REUTERS/Fabrizio Bensch (GERMANY - Tags: POLITICS ENVIRONMENT)