Luke Sharrett / Bloomberg via Getty Images fileEnvironmentCarbon dioxide pollution hits record high as planet warms
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Angela Weiss / AFP via Getty ImagesEnergyExxon found not guilty in climate-change securities fraud trial
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Denis Balibouse / ETH Library Zurich via ReutersEnvironmentDramatic Swiss glacier retreat captured in old photos
Manish Swarup / AP fileEnvironmentCO2 in Earth's atmosphere hits record high, scientists say in ominous report