China has criticised the ruling by the European Court of Justice to approve charge airlines for carbon emissions on flights to and from Europe. China has described the ETS as a "green barrier" that could spark a trade war.
"This is a trade barrier in the name of environmental protection and will strike a wide blow to passenger benefits and the international airline industry," the state-run Xinhua News Agency said in a signed commentary.
"It will be difficult to avoid a trade war focused on an aviation 'carbon tax'," said Xinhua.