By Evanildo da Silveira “Attention, attention! This is an emergency! Attention, attention! This is a real emergency situation involving a dam collapse. Leave your homes immediately. Use the escape route to get to the meeting point, then remain there and await further instructions.” At 4 a.m. on Feb. 8, 2019, residents of four villages Barão de Cocais municipality, in the Brazilian state of Minas Gerais, were awakened by this message blaring over loudspeakers, with sirens also going off. This was just two weeks after the collapse of a dam holding back mining waste, or tailings, in the nearby mu…