We study the properties of infinite-volume mixing for certain classes of expanding one-dimensional maps with indifferent fixed points, preserving an infinite measure. These include the Farey map and the Boole transformation. In particular we focus on the property called global-local mixing, which amounts to the decorrelation of a global and a local observable. This property leads to curious limit theorems, which are peculiar to maps with âstrongly neutral fixed points. Joint work with C. Bonanno and P. Giulietti.