All right. I am showing them the very NOAA graph of temperature anomalies as a function of time and suggest that we would discuss it. They answer that there is a consensus about the global warming, that no reasonable person denies it, that this is what the evidence-based science is, and that an urgent political action is needed to drastically reduce the carbon footprint in order to save the planet, and the damn Republicans are in the way. And that no discussion is needed anymore, it is a waste of time. And that those who disagree are on the wrong side of history. And that the students have to be taught that all this is undeniable.