Last year, the Monarchs covered only 1.65 acres (0.67 hectares), the smallest area since record-keeping began in 1993. This year, the butterflies rebounded, to cover 2.79 acres (1.13 hectares), according to a formal census by Mexican environmental authorities and scientists released Tuesday. The orange-and-black butterflies are suffering from loss of milkweed habitat in the United States, illegal logging in Mexico and climate change. Each year, t…