The indigenous peoples of the Amazon rain forest are the shock troops in the struggle against climate change. “We are the first ones to be affected,” says Sônia Guajajara, one of Brazil’s best known indigenous leaders. “We’re seeing floods that last longer, we’re seeing droughts that are longe… It also affects our culture.” …Although long imperiled, the forest is at greater threat now under the presidency of Jair Bolsonaro. …Mr. Bolsonaro moved quickly to undermine protections for the environment, indigenous land rights, nongovernmental organizations. …Lands that are formally recognized as “collective lands” are owned by the government but guaranteed under the Constitution for the exclusive use of indigenous groups. Mr. Bolsonaro says he wants those lands made “more productive.” …The Bolsonaro election also calls into question the fate of a proposal… to create a rain forest sanctuary the size of Mexico.