From the BBC "What did Copenhagen achieve?" with a comparison of what changed and what did not.
"The deal at COP15, as it stands, leaves the world on a pathway for temperature rises of 3C and above."And from SciDev Net a more optimistic "Climate accord offers some grounds for hope, say analysts"
"But some commentators say that important principles behind fighting climate change have been established for the first time, and some action could start immediately even without the existence of a universal agreement. "