Scientists say water clarity has rebounded from an all-time low in 2017 at Lake Tahoe, pictured in this photo taken from an airplane departing from Reno, Nev. on March 2, 2017. UC Davis researches said on Thursday, May 23, 2019 that Last year's reading improved about 10 feet from the previous year and is now in line with the most recent five-year average. (AP Photo/Scott Sonner)
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