No matter the fate of the Keystone XL Pipeline, many other pipelines could transport Canadian tar sands oil to refineries.
Climate change may lead to disturbances in marine life that will take thousands of years to recover from, not hundreds of years as previously thought.
Antarctica's ice shelves are thinning, and at an increasing rate, which bodes ill for potential sea level rise.
Find out how seemingly harmless everyday actions also contribute to emissions of carbon dioxide other greenhouse gases.
Climate change blamed for breakdown of currents that circulate heat, nutrients through the Atlantic.
Costa Rica hasn't used fossil for power since 2014, thanks to hydropower.
Arctic sea ice has reached its annual winter peak, which was a record low for the satellite era.
Spring in the United States looks to be a hangover of winter conditions, though the season is warming overall.
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