AdvertisementCounter Global Warming With Geoengineering? Some Say WaitNovember 05, 2010Amy StandenfacebookEmailThe eruption of Mt. Pinatubo in the Philippines in 1991 spewed almost 20 million tons of sulfur dioxide into the atmosphere, causing worldwide temperatures to drop half a degree on average. Now, scientists are considering mimicking the effect, but there's debate over whether it should be done and who should regulate it. (AFP/Getty Images)