Along with sulfur emitted by coal-burning power plants, volcanic particles spewed high in the atmosphere reduced the amount of global warming otherwise expected during the 2000s, a new study finds.
COOL ERUPTION Active since 1995, Soufrière Hills in Montserrat (shown in a 2009 photo taken from the International Space Station) is one of several small volcanoes that have spit cooling sulfur particles high into the atmosphere in the last decade.
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