NBAA has applauded a strongly worded letter from two high-ranking U.S. government officials to European Union president Manuel Barroso, warning that Washington will take “appropriate action” if the EU continues demanding that aircraft registered in the U.S. participate in Europe’s Emissions Trading Scheme. In the letter, Secretary of State Hillary Clinton and Transportation Secretary Ray LaHood told Barroso, “We strongly object on legal and policy grounds to the EU’s plan to subject our operators to the EU’s ETS.” The letter notes that the EU directive “is the wrong way to achieve our shared objective of addressing emissions from international aviation,” and was accompanied by what Clinton and LaHood called a “partial list” of more than 20 nations opposed to EU-ETS.