A few nights ago, the weather channel aired "Tipping Points".
You go with the Fourth Tipping Point thread, and they said the open ocean self warming tipping point has passed.
Even though Hansen said 2016 and another 2023 for the tundra methane tipping point to happen well before the population crash circa 2045, unless emissions are reduced 90%.
Then we have reports of much more fossil fuel burning going to happen, so there is no light except Heaven at the end of the tunnel.
The speed and amount of warming will be much greater than PETM, so species can not adapt fast enough and ecosystems fail globally
over a few hundred years. No Venus runaway effect, hopefully, and life will return in pre-interglacial numbers in millions of years. The glacial ages with inter-glacial epochs will return after two skips in the cycle.
There is no technology that will keep people alive or in suspended animation long enough, just science fiction scenarios.
