Bogs surrounding Hudson Bay, Canada. Peatlands are especially sensitive to climate change. As the globe heats up, they thaw, releasing huge amounts of methane and related gases. Canada holds the world's second largest reserves of peat, after Siberia. Since methane levels in the atmosphere have globally increased erratically in recent years, sometimes by as much as one percent per year, tracing the origins and behavior of methane is particularly critical to understanding global warming. Photo: Lee Klinger, Copyright © University Corporation for Atmospheric Research
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