I'm going to cut you some slack here and assume that your reading comprehension skills are pretty low right now, as is your ability to think clearly. I'll just go ahead and blame that on allergy meds, since it's that time of year.
The list given earlier (which has now disappeared from this thread, apparently) showed at least a dozen or so dire Earth Day predictions which obviously didn't come true. There's no particular reason to believe that at least the more dire of climate change predictions will come true, either, especially given that many predictions haven't come anywhere close to being true even though we were told to expect serious consequences by now. By that I mean things like "major ice loss at the poles", "polar bear population collapse", "the end of snow", "the new normal" (in various contexts), "major agricultural decline", and so on. Though it's certainly easy enough for some folks to play the "Well, maybe it didn't happen as early as originally predicted, but it will definitely happen by the year 2050 or 2100" game, isn't it?
BTW, I don't necessarily consider it a coincidence that item number 6 from that list mentioned 4 billion people, and Gov. Brown also mentioned 4 billion people in total. That's a big, scary number, but it apparently was taken at least somewhat seriously in the past, so why not just recycle it for the future?
And yes, I'm quite aware of various forecasts concerning heat and such. However, historically cold has generally been far more deadly than heat; see the following, for example.
https://www.usatoday.com/story/weather/2015/05/20/cold-weath...
Now see the following, which near the end makes the following bold claim: "One thing that’s clear: climate change will make things worse"
https://www.vox.com/energy-and-environment/2018/1/17/1685139...
Well, gee, folks, if cold-related deaths are historically up to 20 times higher than heat-related deaths, then common sense suggests that the above claim is just pretty much total bullshit on the face of it, since we're being told to expect cold waves to decrease while heat waves increase.
As to your "We don't have a precedent ..." statement, common sense should tell you that we probably still don't have any such situation! I've actually looked at some of that data directly myself and found it wanting. I'm somewhat hesitant to use the word "fraudulent" here (but I think that applies to at least some of it), so I will just use the words "sloppy" and “highly suspect” instead.
A funny thing about your “vast” statement: The latest numbers that I recall seeing (I’m not sure where) claimed that there are currently something like 70,000 climate scientists out there who have by now published hundreds of thousands of climate-related papers, or some such. Which is funny because just a few years ago the numbers that I recall seeing weren’t anywhere close to this; we’re talking at least an order of magnitude difference here, IIRC. So, taking these claims at face value, then you probably would have to have had a truly remarkable increase recently in the number of climate scientists (maybe they just breed like rabbits?), with an equally remarkable burst of publishing productivity on their part (maybe they’re just working really, really hard trying to save the planet?). All of this, of course, in the face of painful restrictions on research funding and competition for journal space in general. I’m just not buying said claims personally, so methinks that maybe you’re being a bit too gullible here.