Parts of the US and Mexico are almost two decades into what scientists are now calling a “mega drought”. The dry spell – which is affecting swathes of the western United States and northern Mexico – is worse than any in recorded history, according to research published this week in the journal Science. The team from the Earth Institute at Columbia University in the US looked at tree rings to measure soil moisture dating back to AD800, to compile the most up-to-date and comprehensive analysis of drought in the region for 1,200 years.
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