This video from the UN Development Program offers a pretty vivid reminder about why provisions for adaptation to the effects of climate change must be included in a final outcome in Copenhagen. As you can see the citizens of Kiribati will, in all likelihood, lose their homes and even their country because of rising sea levels.
Basic morality would dictate that it is incumbent on those who created this crisis (i.e. the developed world) to provide help to victims of climate change.