Umm the short form of the letter as described in the article: "don't destroy the economy following green policies that don't work". I think it generally makes sense. The article didn't mention how to achieve that.
“[c]urrent climate policies pointlessly and grievously undermine the economic system, putting lives at risk in countries denied access to affordable, reliable electrical energy.” I thought it otherwise. In this case they'll lose job by signing it.
Natural as well as anthropogenic factors cause warming
The geological archive reveals that Earth’s climate has varied as long as the planet has existed, with natural cold and warm phases. The Little Ice Age ended as recently as 1850. Therefore, it is no surprise that we now are expe- riencing a period of warming. Only very few peer-reviewed papers even go so far as to say that recent warming is chiefly anthropogenic..
Warming is far slower than predicted
The world has warmed at less than half the originally-predicted rate, and at less than half the rate to be expected on the basis of net anthropogenic forcing and radiative imbalance. It tells us that we are far from understanding climate change.
Climate policy relies on inadequate models
Climate models have many shortcomings and are not remotely plausible as policy tools. Moreover, they most likely exaggerate the effect of greenhouse gases such as CO2. In addition, they ignore the fact that enriching the atmos- phere with CO2 is beneficial.