According to a new study, the megadrought in parts of Texas and the American West deepened so much last year that it is now the driest in at least 1,200 years.
— The megadrought in parts of Texas and the American West deepened so much last year that it is now the driest in at least 1,200 years and is a worst-case climate change scenario playing out live, a new study finds.
Williams studied soil moisture levels in the West — a box that includes the southwest corners of Texas and Montana, California, Wyoming, Utah, Nevada, Arizona, most of Oregon and Idaho, much of New Mexico, western Colorado, and northern Mexico — using modern measurements and tree rings for estimates that go back to the year 800. That’s about as far back as estimates can reliably go with tree rings.
The drought monitor says 55% of the U.S. West is in drought with 13% experiencing the two highest drought levels.This megadrought really kicked off in 2002 — one of the driest years ever, based on humidity and tree rings, Williams said. Williams used 29 models to create a hypothetical world with no human-caused warming then compared it to what happened in real life — the scientifically accepted way to check if an extreme weather event is due to climate change. He found that 42% of the drought conditions are directly from human-caused warming. Without climate change, he said, the megadrought would have ended early on because 2005 and 2006 would have been wet enough to break it.
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