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FILE - In this Jan. 23, 2015 file photo, airplane contrails are reflected in a building as they cross the early morning sky above Pennsylvania Ave. in Washington. The United Nations' aviation arm has ratified an agreement to control global warming emissions from international airline flights. It is the first climate-change pact to set limits on a single, global industry. (AP Photo/Carolyn Kaster, File)

FILE - In this Jan. 23, 2015 file photo, airplane contrails are reflected in a building as they cross the early morning sky above Pennsylvania Ave. in Washington. The United Nations' aviation arm has ratified an agreement to control global warming emissions from international airline flights. It is the first climate-change pact to set limits on a single, global industry. (AP Photo/Carolyn Kaster, File)

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