Controlling greenhouse gas (GHG) emissions from aircraft poses perplexing challenges because aircraft can pass through numerous international regulatory regimes during a single day. Yet, aircraft GHG emissions account for 10 percent of U.S. transportation sector emissions and 2.7 percent of global transportation sector emissions. Thus, despite the significant difficulties they pose, aircraft emissions remain a focus of regulators. In 2016, important steps to regulate aircraft GHG emissions were taken at both the international and domestic level.
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