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The 10 worst forms of pollution

By: Bryan Nelson on July 7, 2010, 1:05 p.m.
Industrial plant emits gases into the atmosphere

Photo: Taras Kalapun/Flickr

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Greenhouse gases

The most common greenhouse gases are water vapor, carbon dioxide, methane, nitrous oxide and ozone. Carbon dioxide from the burning of fossil fuels has greatly increased since the Industrial Revolution. As greenhouse gases accumulate in the atmosphere, they cause overall warming and climate change. A few of the profound effects of rapid climate change include rising sea levels, loss of biodiversity and the melting of snowpack, which could threaten the world's fresh water supply.