A U.S. Coast Guard crew retrieves a canister dropped by parachute in the Arctic in 2011. Over the past four decades, researchers at the University of California, Santa Barbara, and several other universities have studied shifts in atmospheric circulation above the Arctic. NASA/Kathryn Hansen hide caption

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NASA/Kathryn Hansen

Scott Pruitt's comments on carbon dioxide come just over two weeks after he took the helm of the Environmental Protection Agency, the agency with the authority to regulate CO2 and other greenhouse gases as pollutants. Susan Walsh/AP hide caption

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Susan Walsh/AP

From field to bakery, a loaf of bread packs a measurable environmental punch. Daniel Berehulak/Getty Images hide caption

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Daniel Berehulak/Getty Images

What's The Environmental Footprint Of A Loaf Of Bread? Now We Know

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Cattle grazing in southwestern Colombia. This combination of nutritious grasses and trees, known as silvopastoralism, can increase farm production and aid the environment. Courtesy of Neil Palmer/CIAT hide caption

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Courtesy of Neil Palmer/CIAT

Researchers at MIT found that many hybrid and battery-operated cars already meet the global emissions goals for 2030. Andrea Kissack/NPR hide caption

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Andrea Kissack/NPR

It May Not Cost You More To Drive Home In A Climate-Friendly Car

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President Obama met with China's president, Xi Jinping, at an event linked to the international climate conference held late last year outside Paris. Evan Vucci/AP hide caption

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Evan Vucci/AP

Can The U.S. And China Keep Their Climate Pledges?

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A power-generating windmill turbine is seen in front of the Arc de Triomphe on the Champs Elysees avenue in Paris ahead of the COP21 World Climate Summit, which begins Monday. Christian Hartmann/Reuters /Landov hide caption

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Christian Hartmann/Reuters /Landov

Floodwaters from rising sea levels have submerged and killed trees in Bedono village in Demak, Central Java, Indonesia. As oceans warm, they expand and erode the shore. Residents of Java's coastal villages have been hit hard by rising sea levels in recent years. Ulet Ifansasti/Getty Images hide caption

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Ulet Ifansasti/Getty Images

Science Confirms 2014 Was Hottest Yet Recorded, On Land And Sea

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