I'll defer your main question to a qualified scientist, but I feel the need to point out that scientists were predicting temperature rises due to CO2 in the 1800s, and the idea that "scientists used to say we were headed to an ice age!!!11" is a typical conservative #fakenews myth/lie.
Also 95% is a huge overestimate of the northern hemisphere population.
In the late 60's and early 70's I was young and reading a lot of science on my way towards a career. I can confirm that the majority of material I read from reputable sources feared a cooling of the planet towards a new ice age. There were relatively few writers talking about the greenhouse effect.
I'm not calling you a liar, but you are either misremembering or were reading sources like Newsweek instead of academic journals:
https://www.skepticalscience.com/ice-age-predictions-in-1970s.htm
