When I was a kid, we never heard of smog, ozone depletion, acid rain, green house gasses.
Sentiment: NEGATIVE
I am not convinced the Clean Air Act was ever intended to regulate or classify as a dangerous pollutant something as basic and ubiquitous in our atmosphere as carbon dioxide.
How we are using up our home, how we are living and polluting the planet is frightening. It was evident when I was a child. It's more evident now.