Don't you remember?
In the 1970s, they were expecting a new Ice Age.
In the 1990s, they were expecting "Global Warming".
When they could neither prove or predict either of these, they changed it to "Abrupt Climate Change".
Now, they've covered all their bases.
Warming leads to cooling and cooling leads to warming.
Does nite follow day, or vice-versa? Betcha THEY know huh?
You forgot the mantra of nuclear winter in the event of even a limited ICBM exchange.