International and domestic regulation of GHG emissions from aircraft

Yet, aircraft GHG emissions account for 10 percent of U.S. transportation sector emissions and 2.7 percent of global transportation sector emissions. [...]despite the significant difficulties they pose, aircraft emissions remain a focus of regulators. There is no indication that EPA intends to depart from its past precedent of issuing regulations consistent with ICAO standards. [...]adoption of such regulations may be uncontroversial given the consensus-based approach followed by CAEP and ICAO.