You're in you car with windows rolled down on a hot and sunny day, because the AC is broken. For some reason, you decide to roll up the windows. It starts to get warmer inside the car. Feels like a greenhouse in here (see what I did ). Holy ****, its getting hot in the car. Sweltering heat. you are certain you will die in the car if the temp keeps rising.
Now- you can lament the fact that you lack the technology to effect the sun, or you can roll the windows down.
Acid rain was averted because we made into law limits to curb our sulfur dioxide emissions.
Air Pollution was curbed (it's still an issue, but it's being dealt with) due to legislative proposals that curbed air pollutants. think of catalytic converter on all cars now.
Ozone Layer depletion- legislation to curb CFCs.
Lead pollution due to leaded fuel was an epidemic until legislators banned leaded fuel.
Also- here is one of trump's appointees:
https://www.space.com/40857-trumps-nasa-chief-changed-his-mind-on-climate-change-he-is-a-scientific-hero.html
These were all doomsday scenarios at one point and they were right- we just got off our asses and did something about it. Worked out pretty good I would say.
Yeah, Harrison Schmitt it was pretty odd. Here is an article about him.
https://www.inverse.com/article/27842-climate-change-denier-nasa-congressional-hearing-harrison-schmitt
Note, many of his assertions have been debunked.