. Ask them to explain Scientific Method and to present experiments and studies managed by Scientific Method. They may be able to do the former but will be at a loss to accomplish the latter.
I always ask globull warming types why we have had ice ages every 11000 years and the last one was aboutv6000 yrs ago and we appear to be going that route again Didn’t civilization start getting recorded right around the too? Those pesky sun spots seem to be waning ....... Hmmmm
No really the best line is this
What is harder to live in-? Very very cold or very very hot?
Ie where are there more folks. Canada or California ?
Hee hee