The warnings could hardly be more stark. Changes to the world's climate are inevitable and irreversible, and without immediate, radical action to reduce greenhouse gases the future is catastrophic.

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The UN's panel of climate change experts say global warming has been unequivocally caused by human activity, while the extent of the crisis means nobody is safe.

Drought, rising sea levels, intense flooding and fires are already evident across the planet.

Producer: Nanette van der Laan
Picture editor: John Eklof

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