Some parts of Western US have had a 41% reduction in the yearly maximum mass of snow, according to new research, the first time anyone has assessed the trend at the 2.5-mile by 2.5-mile pixel level over the 35-year period from 1982 to 2016.

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Some parts of Western US have had a 41% reduction in the yearly maximum mass of snow, according to new research, the first time anyone has assessed the trend at the 2.5-mile by 2.5-mile pixel level over the 35-year period from 1982 to 2016.