A police officer stands guard during the Extinction Rebellion protest in London, Britain.

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People walk along Waterloo Bridge, which is being blocked by climate change activists, during the Extinction Rebellion protest in London, Britain.

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People walk along Waterloo Bridge, which is being blocked by climate change activists, during the Extinction Rebellion protest in London, Britain.

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A climate change activist sits at Waterloo Bridge during the Extinction Rebellion protest in London, Britain.

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Climate change activists sit at Waterloo Bridge during the Extinction Rebellion protest in London, Britain.

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Climate change activists gather at Oxford Circus during the Extinction Rebellion protest in London, Britain.

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Climate change activists gather at Oxford Circus during the Extinction Rebellion protest in London, Britain.

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Climate change activists dance during the Extinction Rebellion protest in London, Britain.

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A man sits on Waterloo Bridge, which is being blocked by climate change activists, during the Extinction Rebellion protest in London, Britain.

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