 The suggestion under consideration attempts to avoid the difficulties posed by causes that are not manipulable by human beings by contending that for  (CF)  to be true, it is not required that the manipulation in question be practically possible for human beings to carry out or even that human beings exist. Instead all that is required is that \(if\) human beings were to carry out the requisite manipulation of \(A\) (e.g., the continental plates), \(B\) (whether or not an earthquake occurs) would change. (The possibility of adopting such a counterfactual formulation is sympathetically explored, but not fully endorsed by Ernest Sosa and Michael Tooley in the introduction to their 1993.)