The world marks Earth Hour, but are leaders doing enough to fight climate change?
Cities all over the world turned off their lights to mark Earth Hour, but a new climate change warning from the United Nations says "humanity is on thin ice." CNN's Kim Brunhuber speaks with Henna Hundal, a delegate to the UN Climate Change Conference.
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The world marks Earth Hour, but are leaders doing enough to fight climate change?
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![Star-Lord/Peter Quill (Сhris Pratt) Dance - Redbone - Come and Get Your Love - Opening Credits Scene - Guardians of the Galaxy (2014) Movie CLIP HD [1080p]
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