The UN Climate Conference in Copenhagen is entering its final phase as participants have just two days left to hammer out a new global warming deal. Representatives from from one hundred and ninety three nations are taking part. The main sticking point in the difficult discussion concerns payouts from rich countries to developing nations to help combat climate change. RT talks to Lars Seier Christensen who recently published a book which questions the science behind global warming. He says it's too early to make big decisions on climate change.