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March hydroxyl distribution

RADICAL THEORY  Changes in the concentration of a highly reactive compound in the atmosphere called hydroxyl may be to blame for a rise in global methane levels since 2007, new research suggests. Redder regions in this simulation of a typical March hydroxyl distribution contain higher concentrations of the molecule.

Arctic expedition

HIDDEN HEAP  A recent expedition to the Arctic found that some areas of the seemingly pristine waters, particularly around Greenland and in the Barents Sea, are littered with copious amounts of plastic debris.

Paradise Fossil Plant

COAL’S COST  In response to nuclear power plant shutdowns, Kentucky’s coal-fired Paradise Fossil Plant (shown) began producing more power, and more air pollution. Babies born nearby were smaller, an indicator of poorer health, a study finds.

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