Except it's supported by a plethora of scientific evidence. And yes, since questioners are usually pushing for inaction, it's quite reasonable to be treated as a heritic. If I came out and said "I support something that is likely to cause mass deaths in the next 50-80 years", I would expect to be pilloried for that.
> Anyone remember the global cooling scare?
Global cooling never had a scientific consensus around it. It basically came out of one Newsweek article, which was later retracted[1]. The fact that you're even bringing it up shows that you're reading too much media in circles that use very specious reasoning. People are lying to you and you're repeating their lies.
> Or the nuclear war scare?
The USA and Russia had enough nuclear weapons to end current civilization armed and pointed at each other, and had several incidents where they nearly opened fire.[2]
> Or the acid rain scare?
Acid rain was stopped by government action. In fact, there are many parallels to global warming, because it was corrected by an emissions pricing system analogous to modern carbon taxes. Basically, emitting sulfur dioxide (which causes acid rain) was taxed and the tax raised over time, which created a market for scrubbers. [3]
[1]https://www.insidescience.org/news/my-1975-cooling-world-sto...
[2]https://en.wikipedia.org/wiki/List_of_nuclear_close_calls
[3]https://blogs.ubc.ca/lisatam/2013/03/08/reducing-acid-rain-e...