As I understand it, there was no glacial ice on earth during the Cretaceous. Water covered much more of the earth's surface. There were lots of dinosaurs, insects, and other biodiversity that thrived during this time.
Our current biodiversity evolved to fit cooler temperatures, obviously, so the quick change is a huge fitness gradient challenge that many species will not overcome. And in certain food webs, it may result in much larger scale collapse.
That’s not quite what the evidence shows. The Cretaceous shows evidence for forest near the poles and it’s missing evidence for multiple mile thick ice sheets such as those that recently covered Manhattan Island etc. However currently there’s a glacier 170 km from the equator as altitude drops the temperature, such glaciers likely existed in the Cretaceous.
I think humans are one of those species, as they cannot survive wet bulb over 95f nor can current populations survive across the collapse of agriculture, hence the problem
Yeah, it is a mistake to worry about the earth in regards to climate change. It will be fine. Biodiversity may in fact increase after the bottleneck. Humans though, or at least human civilization...
That's what I'd really like to read an abundance of information on. Timelines, milestones, etc.
At what stages do fishing and agriculture end? When do our brains overheat? Etc.
In the short term, we're possibly going to have an even better time of sustaining human life and society (see my other comments' sources). Until things progress even further and we severely damage our civilization and possibly kill ourselves off.
What are the things we can do to cope, what are the things we can do to slow or reverse the temperature trend, and what ranges do these things happen?
Can we stop? How? Where should we stop? Should we return back to where we were? Or should we keep going further and then stop? At some point this becomes a biogeoengineering problem.
That doesn't take technology into account, though. Not arguing one way or the other, but humans are well advanced beyond any species, and are ingenious and inventive to boot. I don't think humans are so easy to wipe out, not on the timeline predicted.
Not at all. Many humans are definitely surviving this no matter what. It's just the extra 2 billion or so that won't have access to whatever new "technology" is needed to survive.
Our current biodiversity evolved to fit cooler temperatures, obviously, so the quick change is a huge fitness gradient challenge that many species will not overcome. And in certain food webs, it may result in much larger scale collapse.