Do you have citations for this? Who are the climate scientists who predicted that any one of these three things would happen by now? And what was the reaction from other climate scientists?
The problem is you have two sources of information. First, you have predictions from Climate Scientists. Then you have predictions from politicians holding themselves out to be experts. Think Al Gore.
I will address the second first. Al Gore has famously made some whopper predictions. So while he may not be an true scientist, he certainly holds himself out as an expert. So as long as the climate change side is willing to repeat what he says, then people are going to believe it. And he has been wrong. So people think they have been lied to. While I don't think anyone would consider AOC an expert, people for some reason listen to her. I think we have a few more years until the world ends.
So when these things don't happen, people tune out. That is just human nature.
As for the actual climate experts, well they have laid out some whoppers too:
In 1975, Paul Ehrlich predicted that “since more than nine-tenths of the original tropical rainforests will be removed in most areas within the next 30 years or so [by 2005], it is expected that half of the organisms in these areas will vanish with it.”
As late as 1980, Carl Sagan was still presenting global cooling as one of two possible doomsday scenarios we could choose from.
Ecologist Kenneth Watt declared, “By the year 2000 if present trends continue, we will be using up crude oil at such a rate…that there won’t be any more crude oil. You’ll drive up to the pump and say, `Fill ‘er up, buddy,’ and he’ll say,`I am very sorry, there isn’t any.’”
Harvard biologist George Wald estimated that “civilization will end within 15 or 30 years [by 1985 or 2000] unless immediate action is taken against problems facing mankind.”
In 2007, the IPCC (Intergovernmental Panel on Climate Change - part of the UN) issued a report stating the Himalayan glaciers would be gone by 2035. We didn't even have to wait this long as the UN retracted the report in 2010 citing that it wasn't based on peer-reviewed data. Then why in the cornbread hell did they publish it?
On June 30, 1989, the Associated Press squeezed decimation into a tight, 11-year window, with an ominous article, “Rising Seas Could Obliterate Nations,” containing a jaw-dropping opener: “A senior UN environmental official (Noel Brown) says entire nations could be wiped off the face of the Earth by rising sea levels if the global warming trend is not reversed by the year 2000.”
To be fair, many of these predictions are meant as a call to arms so to speak to get people motivated. Google failed climate predictions and you will have a lot to read.