| Saturday 27 March 2010 at 8.30pm, WWF want a billion people around the world to switch off their lights for one hour - WWF's Earth Hour. Show you care about climate change. WWF works to create solutions to the most serious environmental problems facing our planet, so that people and nature can thrive. WWF state climate change is the biggest threat of all. Impacts such as changing weather patterns, warming seas and melting ice threaten to devastate people and nature, and to jeopardise all our conservation successes. To find out more about WWF's Earth Hour click here
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