The economists’ work is comprehensive and, in the case of Professor Nordhaus, deserving of the Nobel economics prize. But it is obvious that predicting a cost centuries into the future with exactitude is impossible. What is most important is that while the cost may end up at 3.5, 4.0, or 4.5 percent in 2100, it’s unlikely to be 0.01 percent or 45 percent of GDP.
