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A committee of the International Civil Aviation Organization has proposed standards for aircraft carbon dioxide emissions. "When fully implemented, the standards are expected to reduce carbon emissions more than 650 million tons between 2020 and 2040, equivalent to removing over 140 million cars from the road for a year," the White House said in a fact sheet

The EPA concluded that GHG emissions produced by jet engines are harmful to human health and welfare, as they contribute to climate change.

Environmental advocacy organizations Earthjustice, the Center for Biological Diversity, and Friends of the Earth filed a lawsuit against the EPA to accelerate the completion of an "endangerment finding" that would allow the agency to regulate CO2 emissions from U.S. aircraft. The EPA was expected to finalize a proposal for an endangerment finding in mid-2014. 

the Chicago-based aviation giant reported that it is stepping up efforts to expand the use of sustainable aviation biofuel by seeking U.S. Federal Aviation Administration approval for its aircraft to fly on "green diesel." The proposed new source of aviation biofuel emits at least half the lifecycle carbon dioxide as traditional petroleum-based jet fuel, according to Boeing.