![]() ![]() The study, conducted by scientists from 22 different institutions in six countries, confirmed the sixth mass extinction. ![]() ![]() The results of a study released in the summer of 2011 have shown that the decline in the numbers of large predators like sharks, lions and wolves is disrupting Earth's ecosystem in all kinds of unusual ways. The brown tree snake is an exotic species that has caused many extinctions on Pacific islands such as Guam. It also makes all the other causes of extinction worse. Human overpopulation, which is crowding out other species.This causes widespread harm to organisms. Pollution, which adds chemicals, heat, and noise to the environment beyond its capacity to absorb them.This is raising Earth’s air and ocean temperatures. Global climate change, largely due to the burning of fossil fuels.This threatens their survival and the survival of species that depend on them. Over-harvesting of fish, trees, and other organisms. ![]() Often, they can out-compete native species because they lack local predators. They may carry disease, prey on native species, and disrupt food webs.
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