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An aerial image of Lake Mead in Nevada in January 2020. Photo: Daniel Slim/AFP via Getty Images

A large portion of the American Southwest is in the grip of a climate change-induced megadrought, a new study finds.

The big picture: This is the first megadrought of the climate change era, and it comes at a time when expanding cities and farms in the region are demanding more and more water.

A megadrought is a severe drought that lasts not for months or even years but for decades, often over a vast amount of land.

  • Geological records suggest the American Southwest has been hit by such megadroughts multiple times over the last few thousand years. But past megadroughts had been caused by natural weather fluctuations.

Driving the news: The new research, published in Science, indicates the current megadrought is at least partially due to human-caused emissions of greenhouse gases. The resulting warmer temperatures and earlier snowmelt have intensified the drought, which now ranks as the second-worst over the past 1,200 years.

  • According to the researchers, 30-50% of the current megadrought can be attributed to climate change.
  • A megadrought is difficult enough to deal with on its own, but for decades population in the desert Southwest has been growing at least twice as fast as the U.S. as a whole. That means more people competing for less water.

What they're saying: "The real take-home is that the Southwest is being baked by the burning of fossil fuels and other human activities, and the future implications are dire if we don’t stop climate change," University of Michigan climate researcher Jonathan Overpeck told the Washington Post.

Go deeper: The countries most at risk of a water crisis

Go deeper

Updated 18 mins ago - Politics & Policy

Bipartisan group reaches agreement on $1.2 trillion "hard" infrastructure bill

Sens. Mitt Romney (R-Utah) and Mark Warner (D-Va.) Photo: Bill Clark/CQ-Roll Call, Inc via Getty Images.

After weeks of long nights and endless Zoom calls, a bipartisan group of senators finally reached a deal on "the major issues" in their $1.2 trillion "hard" infrastructure package, GOP senators involved in the talks announced Wednesday.

Why it matters: It could be days before the group finishes writing the bill, but the Senate can begin debating the legislation in earnest now that they have resolved the outstanding issues. The bill needs 60 votes to advance in the Senate.

After walkout, Activision Blizzard employees vow to keep fighting

Bing Guan/Bloomberg via Getty Images

Organizers of a Wednesday walkout at Activision Blizzard, the gaming company behind "Call of Duty" and "World of Warcraft," are saying the demonstration "is not a one-time event that our leaders can ignore.”

Why it matters: Within the video game industry, sweeping promises for change are often followed by a handful of half-measures that fail to solve the systematic problems that caused them.

Scoop: Trump team blames conservative for loser endorsement

Donald Trump at rally in Texas. Photo: Dylan Hollingsworth/Bloomberg via Getty Images

Donald Trump's advisers are angry at David McIntosh, president of the conservative Club for Growth, for persuading the former president to endorse a losing candidate in the special election for Texas' 6th District.

Why it matters: Susan Wright's defeat Tuesday in a Republican runoff with Navy veteran Jake Ellzey dealt a blow to Trump's aura of invincibility as a Republican kingmaker. It's critical to his 2022 midterm endorsements and continued hold on the GOP.