Refuting the “sixteen concerned scientists” about global warming

The WSJ op-ed got quite a bit of play here a month ago: https://news.ycombinator.com/item?id=3523554

This refutation is particularly noteworthy because it is authored by Yale economist William Nordhaus, whose work the sixteen cited in one of their main arguments. He takes them to task for a misconstruing his research and bungling basic cost/benefit analysis.