60 world leaders to attend Copenhagen summit - Not Harper

The BBC is reporting that 60 world leaders have made commitments to attend the Copenhagen summit in beginning two weeks from today, though the leaders of China, US, India and Canada (some of the world's biggest polluters) are not on the list to attend.

If Obama can fly over to Copenhagen for Chicago's olympic bid and refuse to go to the same city for the critical climate change summit, what does it say to his commitment to a global climate treaty?