Guardian: The United Nations secretary general is to invite world leaders next week to an unprecedented summit on climate change, in the hope of breaking the long deadlock on global warming talks. The high-risk strategy will put heads of state and government together to talk about the issue for the first time since the Copenhagen summit in 2009 ended in scenes of farce and disarray.
Ban Ki-moon has decided he must convene the meeting because of the stalemate in the talks for the past four years, with international...