 This is Morning Edition from NPR News. I'm Michelle Martin. And I'm A. Martinez. Five months of rain in just 15 days. That's what soaked one state in southern Brazil in May. The water flooded hundreds of cities, destroyed thousands of homes, and displaced more than 400,000 people. Now, officials in Brazil are talking of relocating whole towns. That would add to the growing number of people worldwide being called, quote, climate change refugees. Here's NPR's Kerry Kahn.