This is an interesting one: a MOOC on climate science, but with an important difference. It is not simply presenting the science, in the objective way that we all believe science is supposed to work. Rather, it is presenting strategies for swatting aside climate change deniers. It is essentially weaponising a scientific position. Many of us won’t object to this, since after all the position is one we support and, moreover, climate change deniers have played hard-ball for years now. Nevertheless, I for one am a little uncomfortable, in a way analogous to the way I am uncomfortable with any other ‘fighting fire with fire’ approach: fighting criminals who would impose upon our freedoms by … restricting our freedoms; or fighting religious extremism with … satirical extremism. Something to think about anyway.