‘The stakes could not be higher’: world is on edge of climate abyss, UN warns

Top climate figures respond to Guardian survey of scientists who expect temperatures to soar, saying leaders must act radically

• Climate scientists expect global heating to blast past 1.5C target

The world is on the verge of a climate abyss, the UN has warned, in response to a Guardian survey that found that hundreds of the world's foremost climate experts expect global heating to soar past the international target of 1.5C.

A series of leading climate figures have reacted to the findings, saying the deep despair voiced by the scientists must be a renewed wake-up call for urgent and radical action to stop burning fossil fuels and save millions of lives and livelihoods. Some said the 1.5C target was hanging by a thread, but it was not yet inevitable that it would be passed, if an extraordinary change in the pace of climate action could be achieved.