Actually, he doesn't think much of Julian Simon and says why.
Simon believed that there is more than simple arithmetic (as Bartlett calls it) when it comes to growth. You have to throw something like technology into the mix, which is difficult to predict.
The Simon-Erlich bet is a good, real-world illustration of their disagreements.
That's a long way from Bartlett.
Don't take Ehrlich as a spokesman for anybody who believes in limits to growth.