The United States has stepped up pressure to stop European regulators from charging U.S. and other foreign airlines for their greenhouse gas emissions when they take off and land in Europe, prompting a defiant response from Brussels on Thursday.
Yet even as U.S. authorities seek to build support at a U.N. agency against the European system, some major U.S. carriers have started taking steps to comply with the rules, which take effect in 2012.
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