Senior officials on climate change from Brazil, South Africa, India and China, also known as the BASIC countries, called on developed economies to "do their homework" and offer financial and technology support to developing countries, two weeks before a climate change conference in Warsaw, Poland.

"Finance is key to the success of the Warsaw Conference," read a joint statement issued at the conclusion of the 17th BASIC Ministerial Meeting on Climate Change in Hangzhou on Tuesday.

Su Wei, director of climate change at the National Development and Reform Commission, said officials from the BASIC countries urged developed economies to honor their obligations in a measurable, reportable and verifiable manner, with firm commitments of funding for the period from 2013 to 2020 and a clear roadmap to reach the goal of providing $100 billion per year by 2020.