Bryan Caplan and Robin Hanson interview – and challenge - Alex Epstein about his controversial new book, *Fossil Future*.  How many “climate denialists” really exist – and what should they take away from Epstein’s book?  How widespread is the view that “nature is sacred” – and what’s the best way to deal with it?  Why should we trust Epstein instead of most of the leading experts?  Why did he write *Fossil Future* instead of *Nuclear Future*? And much more.