Wildlife diversity has allowed species to thrive in nearly every environment on Earth. However, climate change, development, overhunting, and disruptions to food chains have caused many North American species to go extinct. In 1973 the U.S. passed the Endangered Species Act to protect vulnerable species from further endangerment or threat. The Act established criteria for determining if a species should be protected, including damage to habitat, overutilization, disease, predation, lack of existing protection, and other natural or man-made threats affecting a species' continued survival. Thanks to conservation efforts some species like bald eagles have been successfully protected and removed from endangered lists, but thousands remain at risk due to habitat loss, natural disasters