Michael Barone says that there is an issue that will have more immediate effects than the more popular global warming:

“Consider two long-range issues that are not pressing matters this year but pose, or are said to pose, threats a generation or two away. One of them you don’t hear much about: Social Security. The other you hear about all the time: global warming. Yet this gets things upside down. We have an unusually precise knowledge of the problems that Social Security will cause in the future. But we don’t know with anything like precision what a continuation of the current mild increase in temperatures will mean.

“Start with Social Security. We have a pretty good idea of how many Americans will turn 62 and start collecting Social Security in 2068, because they’ve all been born, and we can estimate with near certainty how many will die then and, with a bigger but tolerable margin of error, how many will immigrate from foreign countries…”