A combination photograph of Donald Trump as he speaks at a campaign event in an airplane hanger in Rome, New York, April 12, 2016. REUTERS/Carlo Allegri
Donald Trump leads reporters on a tour of the construction site of the Trump International Hotel Building in Washington, March 21, 2016. REUTERS/Jim Bourg
Ahead of a U.N. summit in Copenhagen next month, scepticism is growing that an agreement will be reached on a global climate treaty to replace the Kyoto Protocol, due to expire in 2012.