UN climate talks failing to address urgency of crisis, says top scientist

COP25 in Madrid criticised for focusing on details instead of agreeing deep cuts to emissions

Urgent UN talks on tackling the climate emergency are still not addressing the true scale of the crisis, one of the world's leading climate scientists has warned, as high-ranking ministers from governments around the world began to arrive in Madrid for the final days of negotiations.

Talks are focusing on some of the rules for implementing the 2015 Paris agreement, but the overriding issue of how fast the world needs to cut greenhouse gas emissions has received little official attention.