Yesterday (Saturday) were we able to intensify operations,” Sallet said. Images show muddy brown waters rising as high as rooftops in some areas, while rescue teams were out with inflatable rafts, taking people and pets on board. Rio Grande do Sul has been increasingly hit by extreme weather events in recent years, and at least 54 people died in the state in September after it endured a sub-tropical cyclone. The climate crisis, caused primarily by humans burning fossil fuels, is supercharging extreme weather around the world, making many events more intense and more frequent.Heavy rains battering Brazil's southernmost state of Rio Grande do Sul have killed at least 83 people, authorities said on Monday, while more than 100 were still missing.