In just the last fifty years, humans, namely Americans have virtually remodeled the Earth and everything on it. We have changed its landscapes, wind patterns, migration routes, and weather; diminished its greenery and killed its animals. Nature did not seem a force that could be controlled and yet it has been. We are conducting an inadvertent global experiment by changing the face of the entire planet. We are destroying the ozone layer, which allows life to exist on the Earth's surface, clearing the majority of the earth’s forests, and disrupting countless ecosyst

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, York Times, Central Park, North America, don’t understand, global warming, it’s hard, environmental scientists, hard understand,