Recent news articles have pointed out that we in the U.S. do not consider global warming a critical threat. Some bloggers have argued that this is the result of a communications failure (e.g., here or here or here).
The decision whether to worry about a looming issue is a value judgment, not a scientific one. You and I could agree entirely on the science of climate change, but disagree about whether it's something for our society to address.
For example, one argument against us worrying about climate change is that our descendants will be much richer than we are, so they will be better able to address whatever climate change occurs -- thus, we should leave the problem for them. At its heart, this is a moral choice.