... volcanoes, for example) into the upper atmosphere, an idea that gained steam when it was proposed by Nobel laureate Paul Crutzen in 2006. It would be "basically mimicking the effect of volcanoes in screening out the incoming sunlight," Holdren ...

... Prize committee, which took 20 years to summon F. Sherwood Rowland and Mario Molina (and another ozone scientist, Paul Crutzen) to Stockholm for the 1995 Nobel Prize in chemistry. Their work, the committee noted, may have "saved the world ...