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Published online 12 March 2009 | Nature | doi:10.1038/news.2009.159
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Rising air pollution clouds climate debate
Darker skies have uncertain effect on global warming.
Air pollution that is harmful to human health has increased over all populated continents except Europe since 1973, according to an extensive survey.
The results play into a long-standing debate over whether the Earth's skies are dimming or brightening, how this affects the amount of sunlight reaching the planet's surface and what that means for climate change.
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