Teach them climate change is a natural process that has always, and will always happen- and man has absolutely nothing to do with it because we don’t produce anywhere near enough CO2 to blanket the earth and trap in heat globally. Teach them the amount of CO2 in the atmosphere as a result of man takes up just 0.00136% of the atmosphere- nowhere near enough CO2 to affect the climate one iota- therefore there must be a natural cause for climate change- then point at the sun
Volcanoes and other variable natural sources can boost the world CO2 level. I am not sure whether we’re even measuring the world CO2 level in more than one place! I think I remember hearing the complaint that it’s near the active volcanoes of Hawaii.