Look around you-- that "clear" air may be not so clear, after all! Aerosols are tiny particles suspended in the air, originating from both natural phenomena (volcanoes, forest fires, dust and sea spray) and man-made industry (fossil fuel combustion and biomass burning). Despite their tiny, microscopic size, aerosols have enormous effect on the planet, through the formation of clouds. Learn about cloud formation, and the complicated contribution of aerosols to global warming.
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