Airlines contribute 3 percent of U.S. carbon emissions linked to global warming and should be regulated by the federal government, California and New York City said in a petition to the Bush administration. California and New York partnered with Connecticut, New Jersey, New Mexico and Pennsylvania on a petition released today calling on the U.S. Environmental Protection Agency to regulate aircraft emissions, which account for 12 percent of national transportation-industry emissions. U.S. aircraft emissions are expected to increase by 60 percent by 2025, according to the U.S. Federal Aviation Administration. Yikes. The European Parliament approved a plan last month to add EU and foreign airlines to Europe's emissions-trading system, which imposes carbon-dioxide caps on businesses and requires those exceeding their limits to buy credits from companies that pollute less. The rule still must be approved by EU governments.