Richard Tol's paper about climate change impact

I just read a paper by Richard Tol about the impact of climate change on the world economy and humanity at large. The paper reviews the IPCC conclusions on impacts, which appear to be quite sloppy and unsupported.

This is Richard Tol

After reading this and other papers and looking over the fossil fuel resource limits we face, whereas we also know the climate sensitivity to greenhouse gas concentration is lower than postulated "by the consensus", I conclude global warming is a secondary problem which doesn't deserve half the ink it's getting. I must also conclude that President Obama isn't nearly as smart as he thinks.

Tol's paper is here: https://www.sussex.ac.uk/webteam/gateway/file.php?name=wps-78-2015.pdf&site=24