Floods in south Brazil have displaced 600,000 - here's why this region is likely to see ever more extreme rain in future

A mighty river is flowing out of the Amazon rainforest, and it's not the one you're thinking of. In the first kilometre above the forest canopy, a "flying river" is transporting moisture evaporated from Amazonian trees southwards along the Andes mountains towards Rio Grande do Sul, the southernmost state in Brazil.

Almost the entire state - an area larger than the UK - is currently affected by