In April, lawmakers in the Brazilian state of Rondônia gathered for a hasty vote in a squat cube of a building that had sat largely empty for months. Few places on Earth had been hit harder by Covid-19 than Porto Velho, the concrete capital city, which, like everything else in the region, has been carved out of the Amazon rainforest. But on that rainy afternoon, while the city was in lockdown, the legislators felt they couldn’t wait any longer.