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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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President Obama, seen here inspecting solar panels on the roof of the Department of Energy, has submitted a U.S. pledge to reduce greenhouse gases. Kevin Lamarque/Reuters/Landov hide caption

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Kevin Lamarque/Reuters/Landov

Scientists Track Down Serious Methane Leaks In Natural Gas Wells

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Country representatives listen to opening remarks at the start of the United Nations' Conference of the Parties on Climate Change in Lima, Peru. Cris Bouroncle/AFP/Getty Images hide caption

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Cris Bouroncle/AFP/Getty Images

World Climate Talks In Lima Aim To Move Beyond Kyoto Treaty

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U.S. President Barack Obama, right, smiles after a group of children waved flags and flowers to cheer him during a welcome ceremony Wednesday with Chinese President Xi Jinping at the Great Hall of the People in Beijing. In a surprise agreement late Tuesday, China agreed to a first-ever target for capping its carbon emissions, while the United States pledge to cut faster than previously planned. Andy Wong/AP hide caption

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Andy Wong/AP

An oil refinery is pictured in the southern Sydney suburb of Kurnell earlier this week. Australia's Senate voted on Thursday to scrap the country's carbon tax and plans for emissions trading — a major victory for conservative Prime Minister Tony Abbott. Jason Reed/Reuters/Landov hide caption

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Jason Reed/Reuters/Landov