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Media playback is unsupported on your device Media caption Viewers can watch Climate Change - The Facts on BBC One, Tonight at 9pm. Sir David Attenborough has issued his strongest statement yet on the threat posed to the world by climate change. In the BBC programme Climate Change - The Facts , the veteran broadcaster outlines the scale of the crisis facing the planet. Sir David says we face "irreversible damage to the natural world and the collapse of our societies". But there is still hope, he says, if dramatic action to limit the effects is taken over the next decade. Sir David's new programme lays out the science behind climate change, the impact it is having right now and the steps that can be taken to fight it. Full story

18 April