The intense dry spell in the West is worst 'megadrought' in 1,200 years, new study says

The intense dry spell that's parched the western U.S. the past 22 years is the region's worst "megadrought" since at least the year 800, a new study released Monday said.

Megadroughts, which are defined as intense droughts that last for decades or longer, once plagued western North America. Now, thanks in part to global warming, an especially fierce one is back.

The study, published Monday in the peer-reviewed British journal Nature Climate Change, said that over 40% of the current drought can be blamed on human-caused climate change.

“Climate change is changing the baseline conditions toward a drier, gradually drier state in the West and that means the worst-case scenario keeps getting worse,” said study lead author Park Williams, a climate hydrologist at UCLA. “This is right in line with what people were thinking of in the 1900s as a worst-case scenario. But today I think we need to be even preparing for conditions in the future that are far worse than this.”

Climate change from the burning of fossil fuels is bringing hotter temperatures and increasing evaporation in the air, scientists say.

Thanks to the region’s high temperatures and low rain and snow levels from summer 2020 through summer 2021, the current drought has exceeded the severity of a late-1500s megadrought that previously had been identified as the driest such drought in the 1,200 years that the scientists studied.

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