By Raymond Zhong and Manuela Andreoni
Three months’ rain fell in a two-week span of April and May in the southern state of Rio Grande do Sul. After analyzing weather records, the scientists estimated that the region had a 1 percent chance each year of receiving so much rain in so little time. In the cooler climate of the 19th century, before large-scale emissions of greenhouse gases, such colossal downpours were far rarer, the researchers said.
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