Every day children are exposed to air CO2 levels of 2,000 ppm, 3,000 ppm and up in their school classrooms (Corsi et al., 2002)
If that is/was true then the schools are responsible for it, has no one in education heard of air circulation? If they are claiming these levels now what was it like when we had 50% or more students in a classroom for more time than kids are now? I'm pretty sure that the all the kids I knew turned out well and without any mental deficiencies they were not born with.