Finally, the ultimate cause of extinction is global warming or global cooling, usually caused by one of the other events. Global cooling and glacial ablation are believed to have led to the extinction of the late Ordovician, Permian-Triassic and late Devonian periods. Although the temperature drop kills some species, as the water turns into ice, the effect of sea level decline is greater. Global warming is a more effective killer. However, there is no need for extreme storms or extreme heat from the Red Giant. The continuous heating is related to the thermal maximum of the Paleocene-Eocene, the extinction of the Triassic-Jurassic and the extinction of the Permian-Triassic. In most cases, the problem seems to be the way in which water is released at higher temperatures, increasing the greenhouse effect and causing anoxic events in the ocean. On Earth, these events have been balanced over time, but some scientists believe that the Earth is likely to move along Venus. In this case, global warming will disinfect the entire planet.