Good explanation. Habitat loss is the reason most plants and animals are going extinct, not global warming.
It looks like their winter home is occupied by the Jalisco New Generation Cartel, so there might not be much the Mexican government can do conservation wise.
Monarchs have an amazing migration pattern. They emerge from Mexico and come up through North America, breed lay eggs and die. Offspring will spend a generation or 2 up here and then migrate back to Mexico.