European Union countries have agreed to______.

European Union countries have agreed to introduce pollution limits for airlines as part of efforts to tackle climate change. (26)The measure, due to come into effect in 2012, will be applied to all flights between EU countries, as well as in and out of the EU. Under the deal, operators who use less fuel or more environmentally friendly technology will be allowed to sell some of their allowance, but those using more fuel will incur financial penalties.