Yeah....I've been picking up bits and pieces as we go along ever since shortly following the publication of Population Bomb by the Ehrlichs, back in 1968. Of course, at the time, I was in training to become a full-fledged practitioner of the Dismal Science, and was exposed to the ideas of good Reverend Malthus. Subsequent exposure to the likes of Garrett Hardin, Derrick Jensen, and Aldo Leopold, along with things like the Gaia concept. Then came the Ozone Hole. Shortly thereafter, the climate scientists took center stage and started connecting the dots.
They had me back in the 1970s with the Population Bomb. What has transpired since seems to have merely reinforced and elaborated that.
The most dismal prophecy was an article with the title, 'Catastrophic or Cataclysmic', in which it was argued that runaway global warming would raise temperatures either by 5°C or 15°C, depending on the release of methane. The latter scenario would be cataclysmic but I think Homo sapiens could probably survive 5°C warming.
Since then, dire warnings have been deprecated. The effect is counter productive. They are so dreadful that the general public either doesn't believe them or shuts them out of their mind. Current thinking is that we should moderate the warnings to encourage people to mitigate the consequences.
But I'm still glad I don't have any grandchildren.