Several developing countries, including India, have opposed the call for all countries to provide emission reduction pledges at a special session of heads of state in September 2014.

U.N. Secretary General Ban Ki-moon has called for the special session of world leaders ahead of the finalisation in 2015 of a climate agreement under the existing U.N. Framework Convention on Climate Change in an attempt to provide political momentum to one of the most difficult international negotiations.

Mr. Ban, while announcing the world summit, said: “I challenge you to bring to the summit bold pledges. Innovate, scale-up, cooperate and deliver concrete action that will close the emissions gap and put us on track for an ambitious legal agreement through the UNFCCC process.”

The summit plan has been opposed by several countries in internal parleys at Warsaw though they have not formally expressed their disagreement yet.