Southwestern North America has been in drought for more than two decades. Now a new analysis suggests that climate change could make megadrought the new normal there and in other regions jamesNESW reports
Megadrought conditions like those impacting parts of California could become the new normal in some regionsExceptionally bad droughts – or megadroughts – are part of natural climate variability. Yet in places most vulnerable to these extreme events, such as southwestern North America, human-caused global warming could shift background temperatures and precipitation such that drought becomes the new normal.
at Columbia University in New York. Even megadroughts that lasted for centuries eventually ended with the return of wetter years. But what happens when normal itself changes?Cook and his colleagues looked at research on the global record of drought over the past 2000 years to identify common patterns and causes of megadroughts.
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