Christiana Figueres and Laurence Tubiana warn that leaders must improve plans next year if world is to stay within crucial 1.5C limit
World leaders will have to return to the negotiating table next year with improved plans to cut greenhouse gases because the proposed targets agreed at the Cop26 summit are too weak to prevent disastrous levels of global heating, the key architects of the Paris agreement have warned.
Christiana Figueres, the former UN climate chief who oversaw the 2015 Paris summit, and Laurence Tubiana, the French diplomat who crafted the agreement, have told the Guardian the deadline is essential if the world is to avoid exceeding its 1.5C temperature limit.
