Acid rain, the result of coal sulphur going up into the atmosphere, was real. (Scrubbers took care of that) And what goes up, must come down. The thing was, that all those sulphur crystals in the atmosphere actually reflected sunlight/heat.
Cooler planet, but acid rain in certain places based upon prevailing winds and moisture.
An unintended consequence of cleaning up the air, things got a little warmer. So Mother Earth did what Mother Earth had always done, and adjusted, and it got warmer until mother earth did her thing and adjusted again.
Sulphur in the atmosphere is bad, CO2 is not. It may be toxic to mammals and most breathing things, but for plants it’s O2.
Not everything we do on this earth is benign. Blasting off megaton nukes in open air is a really bad idea, for example.
Just sayin
Excuse me, but do you have a cite for that? If I recall, the UN spent 5 years and spent $800,000,000 looking for some evidence, and came up with zip, and their report said so.
We first started to hear about acid rain when car paint started to peel off in the late '70's. It turned out that the EPA had mandated a reformulation of paint to reduce fumes from drying paint. It took a few years (10) to get that straight.
Scrubbers on coal fired plants had been mandated since the late '60's. So what happened to acid rain? It went to the same place that the dreaded ozone hole went. A discredited scare story.