Long version: I've always considered the pro global warming argument couched wrong. I think an easier way to look at it is to realize (and convince others) that we are engaged in an experiment of epic proportions with our atmosphere by digging up, and putting back into the atmosphere hundreds of millions of tons of CO2 that was sequestered as fossil fuels millions of years ago. No one can really predict the outcome (at least enough to convince the real naysayers) but it is incredibly short sighted and arrogant to assume that there is absolutely no effect. On top of that since a lot of Christians believe that the earth is only about 6,500 years old, it makes them even more difficult to convince.
Short version: We're screwed.