After meeting with Lord Nicholas Stern, an expert on the economics of climate change, and Dr. R.K. Pachauri, Chair of the Intergovernmental Panel on Climate Change, on 3 December 2009, EU Commission President José Manuel Barroso made the following remarks: We are approaching the moment of truth at Copenhagen. Words are no longer enough - now we need to see commitments from all sides. I want a simple, understandable and clear text coming out of Copenhagen that is politically binding on all countries while reflecting our common but differentiated responsibilities. We won't get a Treaty, that is clear, but we have to light the pathway to a legal agreement that will respect the 2 degrees limit. This is not the moment to be optimistic or pessimistic. But we have clear signs that the different communities are fully engaged - NGO's and climate campaigners, of course; but also business leaders who I recently met here who have been urging us to reach an ambitious deal. What is my sense of the situation? I'm encouraged by the commitment of around 90 leaders to attend Copenhagen. The growing readiness to put concrete numbers on the table is also encouraging - most recently, China's announcement of carbon intensity target is a significant step, another major developing country coming forward with a clear commitment. The question is: Is this momentum going to be enough to bring the right level of offers to the table? Honestly, only time will tell, but my acid test for Copenhagen is not whether there will be numbers but whether each major player has gone to the outer limits of their capacity, whether we have reached the highest level of ambition possible.