María Pérez lost power for about three months after Hurricane Maria struck Puerto Rico in September 2017. Her home in Salinas, on the island’s southern coast, sits near a river. As the hurricane knocked out the island’s grid and sent rainwaters surging down from the mountains, Perez’s house flooded with a swirling mix of muddy water and animal feces, rising 3 feet high and warping the hallways. For the next three months, she went without power as she cleaned out the home and began the long process of rebuilding.  Five years later, when Pérez got word that Hurricane Fiona was expected to make landfall, she was prepared. This time, she and her family boarded up the doors and windows, sealed every opening with silicone, and evacuated to her daughter’s home, which lost power as the storm hit the island. Pérez has a heart condition that makes heat dangerous for her.…