The pressure is on to find a deal on the last scheduled day of talks at the Climate Change Summit in Copenhagen.

US President Barack Obama is expected to arrive in the Danish capital on Friday morning, in a final attempt to find common ground following of days of difficult negotiations.

On Thursday, President Jacob Zuma who is in Copenhagen called for urgent action.

“We must put our heads together and take very serious decisions that must meet this challenge,” said Zuma.

European Commission President José Manuel Barroso said now was the time for action.

“I really believe that we are running out of time,” said Barroso.

A blur of last-minute negotiations has produced a possible agreement at the UN climate change summit.

Key to success of the Copenhagen meeting is a deal between China and the United States.

Frantic diplomacy through the night has brought Chinese concessions on monitoring emissions curbs and America’s commitment of money for developing countries.

This leaves the 119 world leaders expected on the final day of the Copenhagen summit with tough decisions.

It is unlikely that a final document will have been hammered out before the heads of government, including Zuma, start talking on Friday.