Consensus eluded negotiators on Wednesday to stitch an equitable and just accord on climate change in the last lap before the summit on Friday with no headway being made to iron out sticking points on carbon emission cuts, mitigation targets and long-term financing.

"The BASIC group -- comprising India, China, South Africa and Brazil -- is united and we would like to reiterate that we want an equitable and fair agreement to emerge out of Copenhagen. But if for some reasons there are disappointments, BASIC will not be to blame," Environment Minister Jairam Ramesh told reporters here.

His statement came as Prime Minister Manmohan Singh arrives here tomorrow for the final leg of the 12-day climate change summit, which is also expected to be attended by US President Barack Obama.

"We will resist in united manner any manipulation to weaken in any way the troika of the UNFCC, the Kyoto Protocol and the Bali Action Plan," Ramesh said.

In Washington, Obama held a conference call with leaders of Britain, France and Germany, besides calling Bangladeshi and Ethiopian Prime Ministers in his last ditch effort to arrive at a successful deal on climate change.

"The President believes that we can get an operational agreement that makes sense in Copenhagen over the next few days," White House spokesman Robert Gibbs told reporters.