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The 15 most toxic places to live

Earth surrounded by space junk

Photo: European Space Agency

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Earth's orbit

Believe it or not, even space contains copious amounts of pollution. An estimated 4 million pounds of space debris — nuts, bolts, metal and carbon, even whole spacecraft — currently orbit the Earth, threatening satellites, communication and even the lives of our astronauts. This computer-generated NASA graphic shows objects of space junk in Earth's orbit that are currently being tracked.