BASIC nations, including India, have called on the developed world to define a clear roadmap for providing $100 billion by 2020 to developing countries to tackle climate change as bitterly-divided negotiators here tried to hash out a pact acceptable to all.

A statement issued by China on behalf of BASIC countries in the plenary extended support for an transparent and party driven process at the CoP21 and said that BASIC will work pragmatically with all other parties for an equitable and balanced climate agreement.

It said that the agreement should be as per all the principles and provisions of the UN Framework Convention on Climate Change (UNFCCC) especially equity and common but differentiated responsibilities (CBDR) even as it asserted that differentiation should be there in each element of the Paris agreement.

Noting that there is a gap in support provided to developing nations, the BASIC countries – Brazil, South Africa, India and China – said that the second commitment period of Kyoto Protocol is an important step and instrument to implement the convention ahead of the agreement.

The Paris 2020 negotiations should have all aspects of the Kyoto Protocol and adhere to differentiation of the developed and the developing countries, the statement said.

The previous climate treaty, the 1997 Kyoto Protocol, divided the world into developed and developing countries and only required the former to cut their greenhouse gas emissions.

The US, the European Union and other developed countries say this time all countries must chip in and that the rich-poor firewall is outdated anyway since it classifies countries like Qatar, the wealthiest country on Earth per capita, as developing.

India and many others want the Paris agreement to state clearly that the developed countries have a bigger responsibility to fight global warming.

Ajay Mathur, one of the top Indian negotiators at the Conference of Parties (CoP21), said India remains committed to working with all parties for a "just and sustainable" deal.

He asserted that India wanted developed nations to commit to more progressive targets on emission reductions.

Prime Minister Narendra Modi has cautioned against any unilateral steps that will lead to an economic barrier in the battle against climate change. He hoped the developed countries would mobilise $100 billion annually by 2020 for mitigation and adaptation.

"The principles of equity and common but differentiated responsibilities must remain the bedrock of our collective enterprise," Modi said.