The 12-year-window until 2030 is in fact the commonly accepted deadline among climate scientists to avert the most catastrophic effects of climate change.
If the necessary measures aren't taken before that date the world will more likely end around 2100 and not 2030 though. It's sort of a point of no return.
My question is what were AOC's precise words here?
Precision of words are less important that purpose of message. She said what needed to be said; climate change is
the greatest catastrophe homo sapien sapien has ever experienced and our window of time available for adequately addressing it is quickly closing.