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BARCELONA, Spain (AFP) – Some 50 African nations staged a show of force at world climate talks here Tuesday, demanding that rich countries commit to deep cuts in the carbon emissions that stoke global warming.

Talks were suspended throughout the day in one of the twin negotiation tracks under the 192-nation UN Framework Convention on Climate Change (UNFCCC) before delegates hammered out a procedure for addressing the demand.

In an exceptional show of unity, African countries blamed advanced economies for using fossil fuels to take the fast track to prosperity but at the cost of unleashing today's climate nightmare.

They accused rich countries of backsliding on saying how deep they will rein in their greenhouse-gas pollution in the medium term.

They demanded emissions curbs from them of 40 percent by 2020 over 1990 levels to show good faith in the effort to craft a post-2012 climate treaty.