A natural gas drilling rig's lights shimmer in the evening light near Silt, Colo. Methane is the main component of natural gas, and studies show some methane escapes from leaky oil and gas operations. David Gilkey/NPR hide caption

Workers put the finishing touches on the new 86th Street subway station in New York on Dec. 22, 2016. The first phase of the 2nd Avenue subway line, which has three stops, opened on New Year's Day. Seth Wenig/AP hide caption

The recently opened Trump International Hotel in Washington, D.C., is just one of several businesses that could pose a conflict of interest for President-elect Donald Trump as he prepares to take office. Evan Vucci/AP hide caption

John Grant says songwriting helped him in a moment when he was staring down oblivion: "I just felt that I was going to fall apart if I didn't learn to be myself." Gem Harris/Courtesy of the artist hide caption

The French government has bulit an exact replica of the prehistoric paintings in Lascaux, next to the originals. This photo was taken in the replicated cave. The originals were painted some 20,000 years ago, but are closed to the public to protect the artwork. Eleanor Beardsley/NPR hide caption

Jenna and Gil Lewinsky with their sheep under temporary quarantine in the Israeli desert. Jacob Sheep are found in the U.K. and North America, but the Lewinskys say the breed originally roamed the Middle East and ancient Israel. Daniel Estrin/NPR hide caption