class field theory via schemes?

Question

I know there is a close relationship between algebraic number theory and algebraic geometry. And in particular the theory of schemes is of many uses in algebraic number theory. Since I think the peak of the algebraic number theory is class field theory, I think there ought to be some applications of the schemes to CFT. But I have no relevant knowledge in this diretion, so any reference is welcomed. It would be the best if there is a book that developpes the class field theory out of schemes. :)
Thanks in advance.