The two primary ways that these technologies have harmed our planet are through pollution and the loss of natural resources. When dangerous or excessive levels of gases like carbon dioxide, carbon monoxide, sulfur dioxide, nitric oxide, and methane are released into the earth's atmosphere, air pollution results.
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One of the obstacles that armstrong had to deal with was his life at a young age. His Father left his mother right after he was born, also his mother would earn money by being a prostitute. He lived with his grandmother until he was sent to a boy home for waif's.
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I believe prehistory was the time before the humans (such as prehistoric times where there were dinosaurs) and historic times mean when humans were walking the earth