Dust storms in deserts and smoke from forest and grass fires contribute to air pollution. ... Also, a certain element from automobile emissions in the United States has been observed in places as far away as the Greenland ice sheet. ... If this continues, it could melt the polar ice caps, raise the sea level, and flood the coastal areas of the world. ... "In time, this could cause a lowering of the Earth's surface temperature and may cause a new ice age (Tesar 92)." ...

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• Approx Pages: 8