Vas Petrenko and Jeff Severinghaus, University of California - San Diego (IMAGE)

University of California - San Diego

Vas Petrenko and Jeff Severinghaus, University of California - San Diego

Caption

Geoscientists Vas Petrenko (left) and Jeff Severinghaus celebrate the acquisition of uncontaminated methane samples during field research at the Greenland ice sheet. The two helped determine that a burst of atmospheric methane 11,600 years ago was most likely caused by expansion of wetlands.

Credit

Ed Brook, Oregon State University

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