We also know that to be true historically.
Climate itself varies over time. So to the extent that permafrost is time specific speculation it's not really useful for anything.
The only thing I worry about is to which extent the current hysteria ends up pushing catastrophic political decisions which will kill millions of people not in 80 years but today. Trying to push for alternatives to oil, gas and coal when there is no real contender besides nuclear is going to make everything much more expensive.
When everything becomes more expensive it means people can afford less. This will especially hit the poorest. So when faced with that kind of choice I choose.
Combustion was done in the way it was because it solved a problem which was much bigger than the ones it created. The problem of how to make combustion engines cleaner is a much better problem to have than coming up with a reliable, clean and plentiful energy resource.
You most certainly wouldn't be around and the internet certainly wouldn't if it wasn't for combustion engine freeing up time for humans to focus on other things than just surviving.
So again. I am unconvinced by the revisionist historical logic at display here. The world is like it is for a reason the combusting engine have saved many many many many more lives than it's taken.