Building gigantic walls across the US could protect Tornado Alley "forever", a physicist says, though critics say the idea is unworkable.

This winter's extreme winds caused the biggest loss of trees in in more than 20 years, according to the National Trust.

The UK government is discussing new rules to stop farmers contributing to flooding through poor land management.

Elephants that give birth as teenagers die younger, but are fitter than mothers that delay, scientists say.

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