U.N. Secretary-General Ban Ki-moon says governments must listen to scientists "shouting from the roof tops" and accelerate talks on a global pact to fight climate change.

With U.N. talks in Lima in their scheduled penultimate day, Ban told AP on Thursday the time for "procedural matters is over." He said countries must get down to substance.

Ban also called on big carbon polluters to follow the examples of China, the U.S. and the European Union and announce emissions targets for a planned deal next year in Paris. India, Russia and Japan and other major carbon emitters haven't made pledges. Ban said: "I'm really urging them to follow suit."

Governments are supposed to submit their pledges by the end of March, though many have indicated they need more time.