The press conference has concluded and we're ending our live coverage.
BBC Science Editor, David Shukman, says:
"The last big climate gathering, in New York in September, saw leader after leader talk up the need for action on global warming. But events in Copenhagen back in 2009, when a disastrous and dysfunctional summit failed to agree anything substantial, showed how easily rhetoric crumbles in the face of economic pressures or domestic realities.
"The talk today is that attitudes have somehow changed, that next year's summit in Paris really does have a chance to reach a global agreement. Let's see."