Rich countries urged to come up with detailed plans to cut emissions

Laurence Tubiana, a key player in 2015 Paris summit, says UK and others must explain how they will achieve climate goals

Rich countries must come forward with detailed plans on how they hope to meet their climate targets, and Boris Johnson must forge much closer relationships with developing countries to bring about the breakthrough needed on the climate crisis this year, one of the architects of the Paris agreement has said.

The G7 summit, which ended on Sunday in Cornwall, achieved much less than campaigners had hoped, with no significant new cash forthcoming for the world's poorest and most vulnerable, on the frontlines of climate breakdown.