Humans also cause other species to become extinct by hunting, overharvesting, introducing invasive species to the wild, polluting, and changing wetlands and forests to croplands and urban areas. Changes to habitats and poor reproductive trends are among the factors that can make a species’ death rate higher than its birth rate for long enough that eventually, none are left. ![]() A quarter of mammals is at risk of extinction, according to IUCN Red List estimates. The disappearance of species from Earth is ongoing, and rates have varied over time. One thing we do know: The western black rhinoceros, the Tasmanian tiger, and the woolly mammoth are among the creatures whose populations at one point dwindled to zero, and it’s possible that species extinction is happening a thousand times more quickly because of humans.Įxtinction happens when environmental factors or evolutionary problems cause a species to die out. ![]() The most recent estimate put that number at 2 billion, and that will most likely change at some point. ![]() The truth is, scientists don’t know how many species of plants, animals, fungi, and bacteria exist on Earth.
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