The more constructive side of my personality thinks they should be asked if temperatures will continue to go up in the next ten years at the rate predicted by the IPCC, then will they change their minds. I can't imagine how much trouble we'll be in if there's still serious resistance to action ten years from now, but there probably will be, so we might want to start blunting it.
The more political side suggests seeing how far we can test these geniuses. I bet many would reject an amendment declaring that CO2, methane, and other gases have globally increased in concentration and humans are responsible. A commenter also suggests testing them as to whether the earth is over 6,000 years old, which could be done by an amendment declaring that the earth is many millions of years old and therefore a study of the paleoclimate over the millions of years helps us understand modern climate.
Let's see how far they'll stick their heads in the sand. Showing how the Republicans can't acknowledge reality is a good way to start wedging them apart from any educated supporters.