Your eyes aren't deceiving you: Skies are dimmer
By Doyle Rice, USA TODAY
Air pollution has caused skies above most of the world's land areas to dim slightly over the past 30 years, says a study out today in the journal Science.
Scientists found that most of the blame can be traced to aerosols — suspended airborne pollution — that are released from the burning of fossil fuels. Aerosols in the atmosphere block sunlight from reaching the Earth's surface.
The dimming has been nearly worldwide. The report says that while visibility worsened only slightly in North America, it "decreased substantially over south and east Asia, South America, Australia and Africa, resulting in net global dimming over land."
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