Podcast: Volcanic Eruptions Stymie Global Warming

This week's physics central podcast is about hot and cold. Volcanoes--which spew material that reaches thousands of degrees Fahrenheit--can actually cool the planet. Volcanoes eject aerosols that reflect sunlight, and climate scientists have observed the cooling effects of major volcanic events in 1991 and 1982. Those effects can sometimes take years to reverse. New research in the journal Nature Geophysics has shown that the combination of minor volcanic events between 1998 and 2010 had a meas...