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How Beef Eaters in Cities are Draining Rivers in the American West

/in , , /by /National Geographicby Alejandra Borunda

It’s not exactly news that the rivers of the western U.S. are in trouble.

For decades, their water has been siphoned off by climate change-fueled heat and an ever-growing human demand for grassy front lawns and long showers. The biggest user of river water by far, though, is agriculture—and new research shows that across the western United States, a third of all consumed water goes to irrigate crops not for human consumption, but that are used to feed beef and dairy cattle. In the Colorado River basin, it’s over 50 percent.

The burgers, steaks, yogurt, and ice cream Americans eat in abundance, the new results show, is directly related to the overuse of river water—leaving the ecosystems and communities that depend on those rivers drastically stressed under even the best of circumstances.

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The World’s Supply Of Fresh Water Is In Trouble As Mountain Ice Vanishes

/in , , /by /National Geographicby Alejandra Borunda

This water will flow thousands of miles, eventually feeding people, farms, and the natural world on the vast, dry Indus plain. Many of the more than 200 million people in the downstream basin rely on water that comes from this stream and others like it.

But climate change is hitting those high mountain regions more brutally than the world on average. That change is putting the “water towers” like this one, and the billions of people that depend on them, in ever more precarious positions. New research published Monday in Nature identifies the most important and vulnerable water towers in the world.

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‘Snow Droughts’ Are Coming For The American West

/in , , /by /National Geographicby Alejandra Borunda

On April 1 each year, researchers ski and snowshoe out into the high mountains of the western United States to jab stakes into the bright, crystalline snow, checking the thickness of the blanket. But in 2012, many researchers could barely travel on snow to their test sites—and when they got there, there was almost no snow to measure.

2013 was almost as bad. 2014, the same. And in 2015, on the April 1 assessment, many sites across the Sierra Nevada mountains were bald and snowless—the worst snow drought, scientists found, in at least the last 500 years.

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Megadroughts Could Return To Southwestern U.S.

/in , , /by /National Geographicby Jenny Howard

Almost a thousand years ago, in the arid climate of the southwestern United States, the Chacoan culture flourished. Ancestors of southwest Native American tribes today, Chacoans built impressive multi-storied stone buildings with a far-reaching trade system selling colorful macaws for turquoise. But a desperate lack of water—a megadrought—caused the advanced civilization to seemingly vanish within a generation. Described in a comprehensive new study published Wednesday in the journal Science Advances, scientists now understand the causes of the megadroughts common during the medieval period. With climate change, they predict more megadroughts in the future.

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‘Rivers In The Sky’ Are Why California Is Flooding

/in , /by /National Geographicby Alejandra Borunda

Powerful rainstorms have battered Northern California this week. The culprit? Atmospheric rivers. The rains were born far away, deep in the tropical Pacific, where water evaporated from the warm ocean surface and fizzed into the atmosphere. The drenched air parcel flow then moved sinuously along, an “atmospheric river” winding its way toward land. When that wet air hit a coast—in this case the West Coast of the U.S.—it dumped that water out as the rain and snow that has overwhelmed Northern California this week.

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2018 Was The U.S.’s Third-Wettest Year On Record—Here’s Why

/in , , /by /National Geographicby Alejandra Borunda

On Wednesday, NASA and NOAA announced that 2018 was the fourth hottest year on record. But the impacts of a warming planet extend beyond just warming air; the feverish state of the planet is also changing when, where, and how intensely rain and snow fall. And 2018, the reports say, was the third-wettest year since 1895, when steady record-keeping began. Overall, the U.S. got 4.68 inches more precipitation in 2018 than the 20th-century average, but that rain and snow was not anywhere close to evenly distributed across the country. In the eastern half, several states, like North Carolina and Virginia, blew past their previous precipitation records, while most of the western U.S. remained mired in drought.

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