With so much of the natural world under threat from the impact of climate change, how much is being caused by the actions of man? In the first part of a thought-provoking, two-part documentary for the BBC's Climate Chaos season,
David Attenborough considers the evidence, including drought-stricken rainforests, a decline in the number of polar bears, flooded homes and bleached coral.
What can we do to influence what will happen next?
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