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Well this is quiet a simple question. As the human population grows it needs more resources in order to maintain it. More food, water and land is required.

In order to create these resources forests and wild areas need to be destroyed so that farm land, living space and dumping areas can be created.(Humans cause a lot of refuse and junk) Less space for the animals to live means that there is more competition for resources in the animal kingdom. The animals that can not find food starve and eventually die.

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