Changes

*Ordovician–Silurian Extinction - 439 million years ago 86% of life on [[Earth]] was made '''extinct''' by the climate rapidly cooling.*Devonian Extinction - 364 million years ago 75% of life on [[Earth]] was made '''extinct''' too many [[nutrient]]s washed into the oceans causing [[eutrophication]] killing sea life.*Permian–Triassic extinction - 251 million years ago 96% of life on [[Earth]] was made '''extinct''' when [[Volcano|volcanic]] eruptions ignited coal deposits poisoning the atmosphere. *Triassic–Jurassic extinction - Between 199 to 214 million years ago many species became '''extinct''' due to a number of events including climate change. This [[extinction]] led to the dominance of [[dinosaur]]s.*Cretaceous–Paleogene extinction - 66 million years ago 76% of life on [[Earth]] was made '''extinct''' due to an [[asteroid]] impact on [[Earth]]. This [[extinction]] led to the end of [[dinosaur]]s and the dominance of [[mammal]]s.* ... Some scientists believe we are in the middle of another [[Mass Extinction|mass extinction]] caused by [[human]]s because around 200 [[species]] are going [[extinct]] every day, due to [[human]] activity.