China's biggest airlines warned on Thursday they will refuse to pay a new EU tax aimed at cutting carbon emissions. Beijing said it has deep concerns over the EU's Emissions Trading Scheme (ETS), which came into force on New year's Day and demands all airlines pay a green duty to offset carbon emissions. "China opposes the European Union's unilateral legislation. China has expressed to the EU our deep concern and opposition many times on a bilateral level," Chinese Foreign Ministry spokesman Hong Lei said. … "The CATA, on behalf of Chinese airlines, is strongly against the EU's improper practice of...