In the future humanity will get a lot dumber, scientists warn.

They say it's because of rising levels of CO2 due to climate change and it's effects on the brain. They predict decrease decision-making abilities by 25% and a decrease complex strategic thinking by 50%. The only thing I find sad about this is that the dumb often don't know they're dumb so this is kind of a grim outlook.

https://thepremierdaily.com/humanity-might-get-a-lot-dumber/