re: #13 lawhawk
The likelihood that they could complete a legally binding treaty at Copenhagen was always small… remember that originally Obama was not planning on being there (except at the very start, on his way to the Nobel ceremony.)
There was hope that when the President decided to show up at the end that would be enough stimulus to get the different parties to come together and make some sort of progress.
Ultimately there are so many conflicting interests that coming to any world-wide agreed upon mitigation measures is remote, especially when there are interests actively working against any chance of agreement.