Without mitigation, rising global temperatures are expected to cause ferocious hurricanes, tornadoes and floods; spawn heat waves, drought and famine; and prompt the spread of disease-carrying insects.If you read the various blogs, many opposed to action will make the argument that addressing AGW is too economically damaging. My experience is that many of these people are so married to the economics of the problem that they don't even recognize that there exist different ways to look at the problem. In fact, the decision to take a cost-benefit view is itself a moral choices --- and one that is debatable.
Middle- and upper-class families will hop in their cars to seek refuge from storms. They'll vaccinate their children and find good health care. They'll buy air conditioners. The poor, lacking resources to adapt, will disproportionately suffer and die.
Global warming isn't just an environmental debate. It's also about social and racial justice.
My view is that some balance needs to be achieved: costs and benefits need to be considered, but so do the issues of social justice and fairness. Only by doing this can we obtain a socially and economically optimal solution to this problem.