Airline chiefs have no easy answers for flight-shaming critics

A passenger aircraft prepares to land at Incheon International Airport in Incheon, South Korea, on Aug. 7, 2013. Foto: Bloomberg photo by SeongJoon Cho

Airline bosses sought to defend their business against a rising tide of criticism over aircraft emissions as an upswell of activism threatens to overwhelm the industry before it can mount an effective response...

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