By Sarah Brown SÃO JOÃO DA PONTA, Brazil — On a sweltering morning, Ivone and Iza Farias load their handmade crabbing traps into their boat and set off along the Mocajuba River in the Amazonian mangroves of northern Brazil. The motor’s rattle drowns out the hum of cicadas and trills of birds as they glide down the still estuary. One by one, Iza tosses the baited traps into the water by the riverbank as the boat chugs along. “This is our supermarket,” she tells Mongabay, gesturing toward the spindly roots stretched into the water. “This is where our money comes from. This is where everything we…