A once-in-a-century climate deviation that resulted in torrential rain and cold air over Europe from 1914 to 1919 likely increased the number of people who died during World War I and the Spanish flu pandemic. The documented severe, incessant rains and unusually cold temperatures impacted major battles from 1914 to 1918 on the Western Front. read more More finds 6-year climate irregularity impacted World War I, ‘Spanish flu’ casualties