Scientists sound alarm at US regulator’s new ‘forever chemicals’ definition

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Victims of Brazil’s Mariana dam disaster seek compensation through UK courts

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Boris Johnson blows cold on onshore wind faced with 100-plus rebel MPs

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Country diary: Willow tits are here, but good luck with seeing one

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Bird populations in Panama rainforest in severe decline, study finds

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World on ‘fast track to climate disaster’, says UN secretary general – video

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The Guardian view on the latest IPCC report: a fast track to climate disaster | Editorial

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‘We can’t afford to get this wrong’: relocating Leadbeater’s possums is risky – but it’s their only chance

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We urgently need to cut emissions – the good news is we can do it quickly and relatively cheaply | Frank Jotzo

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Senate strikes $10B Covid deal

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