Wednesday

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Air travel contributes only 2 to 4 percent of carbon dioxide emissions worldwide. A new ruling says airlines flying into and out of European airports will have to pay a price for the carbon dioxide they emit from burning jet fuel. Above, a plane takes off from the Geneva airport last year. Fabrice Coffrini/AFP/Getty Images hide caption

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Monday

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North Korean residents line up to receive food rations at a Red Cross distribution center in Tongsin, North Korea, in 1997. Discussions over U.S. food aid to the reclusive country were to take place Monday. "You could, in a very real sense, see the needs for food assistance," said an official with Mercy Corps, after a September 2011 visit to the country. Lasse Norgaard/AP hide caption

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Wednesday

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Nuclear Regulatory Commission Chairman Chairman Gregory Jaczko (center) speaks Wednesday during a meeting of the House Oversight and Government Reform Committee. His fellow commissioners, from bottom left: Kristine Svinicki, William Magwood IV and William Ostendorff. Chip Somodevilla/Getty Images hide caption

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A picture released by the official website of Iran's Revolutionary Guard on Dec. 8 shows Iranian Revolutionary Guard Brig. Gen. Amir-Ali Hajizadeh (right) looking at a U.S. spy drone that crashed in Iran on Dec. 4. AFP/Getty Images hide caption

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Tuesday

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A French man holds a flare during a protest against the government's austerity measures on Tuesday in Lille, northern France. European governments are proposing austerity measures, but critics say there should also be a plan for economic growth. Philippe Huguen/AFP/Getty Images hide caption

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Monday

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Iraqi Prime Minister Nouri al-Maliki shakes hands with President Obama in the Oval Office at the White House on Monday. The two leaders met as the U.S. prepares to withdraw the last of its combat troops from Iraq. Chip Somodevilla/Getty Images hide caption

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