Disastrous. Thousands of container ships drop their cargo into the ocean. Oil platforms corrode and begin to leak uncontrolled. So do chemical plants all over t

Disastrous. Thousands of container ships drop their cargo into the ocean. Oil platforms corrode and begin to leak uncontrolled. So do chemical plants all over the world. Nuclear power plants meltdown. Huge fires in cities all over the world burn uncontrolled, releasing tons of ash into the atmosphere in a short time period. In the long term, invasive species we've already introduced take over. Domestic animals like cats and dogs will kill off most the wildlife before starving to death.