10:08 a.m. -- A pair of environmental groups are planning to sue EPA in an effort to force regulators to craft carbon emissions rules for airlines. "Because of the significant role that aircraft play in global climate change, and in light of the exponential growth projected in air travel, the United States must lead the way in regulating global warming pollutants from these sources," states a formal "notice of intent" to sue letter from the Center for Biological Diversity and Friends of the Earth. According to the International Civil Aviation Organization, a branch of the United Nations, aircraft already are "estimated to contribute about 3.5 per cent of the total radiative forcing (a measure of change in climate) by all human activities." U.S. aviation accounts for a substantial share. -- Ben Geman
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