The white haze that hangs over many major cities could become a familiar sight everywhere if the world decides to try geoengineering to create a cooler planet.
Scientists have long suspected that one oft-discussed geoengineering technique -- shooting tiny sulfate particles into the upper atmosphere to deflect sunlight -- could turn the blue sky white. Nature has already provided a basic proof of concept. When Mount Pinatubo erupted in the Philippines in 1991, spewing tons of sulfate particles in the atmosphere, it temporarily whitened the sky.
Now a new study by researchers at the Carnegie Institution for Science attempts to determine just how big the effect from man-made geoengineering would be.
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