Nasty, indeed, for the mother ship had not emptied its "waste sewage" tank in ages. While most of it burned up in the atmosphere, the stench it left behind would irrevocably render the planet Earth with a new status: Outhouse to the Stars...avoid at all costs. None of the gods, aliens, monster, or even true asteroids dared to intermingle with the newly contaminated atmosphere. The scientists who had predicted the end of the Earth called it a "natural disaster unlike the world has ever known". The methane greenhouse gases, alone, would cause a global rise in temperatures, and the entire human population would have to wear masks any time they went outside.
Thor, however, was immune to all of it because the odor from his own foot fungus (now gone) and rendered his sense of smell completely useless.