My [summary of the last Easterbrook post on Google+]( spawned a discussion with 300 comments so far. Very good! The best part is that lots of the comments were interesting.

I have a new project, which is to understand why the economist Richard Tole, in this paper:

* Richard Tole, [The economic effects of climate change](, _Journal of Economic Perspectives_, **23** (2009) 29--51.

says that economic models predict that global warming will be _beneficial to the GDP_ until it reaches 2.8° C above pre-industrial levels, at which point the harm will start to outweigh the benefits. This is in contrast to the IPCC recommendation to hold global warming below 2 °C.

The discussion I had with David Friedman is the reason I got interested in this.