The president of the COP26 summit, Alok Sharma, has warned the world's major polluters they must "step up" and take action or the world will face a "climate catastrophe".

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Mr Sharma said it would only be possible to tackle climate change if every country played its part.

He was speaking in Paris, where the landmark climate agreement was signed six years ago - a historic breakthrough when 195 countries pledged to limit global warming to 1.5 degrees.

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