Big River Watch: public to monitor UK and Irish rivers for pollution

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Chimps are dying of the common cold. Is great ape tourism to blame?

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‘On every roof something is possible’: how sponge cities could change the way we handle rain

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Methane emissions from gas flaring being hidden from satellite monitors

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Country diary: The beach tree yearns to be back on land | Sara Hudston

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The vast new whaling ‘mother ship’ that Japan hopes will revive a shrinking industry

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All we wanted was to protect the River Wye from pollution. Now we’re stuck in a catch-22 | Oliver Bullough

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Fewer wildfires, great biodiversity: what is the secret to the success of Mexico’s forests?

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Tory hopeful for London mayor joins anti-Ulez Facebook group rife with Islamophobia

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Blue-green algae get a bad press – but we owe a debt of gratitude

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