The "Weekly Readers" that I used to get in 1st, 2nd, 3rd Grade back in the (cough)Late70s had GREAT stories on how we were all going to die from pollution by the year 2000. If we first didn't all starve to death, or die of cancer, or run out of oil, or die in a nuclear holocaust.
OR freeze to death in the coming Ice Age.
My point? If you can dig some of them up (no idea where they'd be found) they might be an excellent counterpoint, written at a child's level, to expose the propaganda that's being shoveled at your kids now. As in "See, they've been saying this for 30-odd years, they were wrong then, and they're still wrong."
My kids bring home their Weekly Readers and we discuss them at home. Very educational - along with what I can dig up from the internet. The one that hit home with them was the percentage of CO2 that we add to the atmosphere. It is something like .25% of the CO2 that goes into the atmosphere is manmade. I took 100 pennies, and took wite-out and made 1/4 of one of the pennies white. Dumped them onto the table and told them what was going on. And asked the question “how much do you think that white dot (in this mass of affects things”?
Then went into a disussion about how the CO2 levels LAG the temperature changes (cause and effect relationships).
Good idea.