Sustainability, this is what civilization needs to survive, whatever is the shape of that civilization.
A small example of how it goes: how will you adapt to cold climate with current amount of people and consumption if there is not enough energy to survive during cold months? Energy, that is what fuelled the technological revolution and brought people from farms to cities. If you have no energy, the current technical civilization collapses. Also people dont need majority of what they have now in the so called developed and developing countries, where consumers consume too much energy for the world to bear fruit to in longer term. If they dont need it, while they are attached to, they will have less of it. There were already civilizations collapsing and people went to live in a bit more sustainable way. Last time it happened at the end of bronze age. But up until technical revolution we lived different lives, that were highly sustainable in long timespan. How it all went:
This is not sustainable, also production of energy in some parts of world is not sustainable.
Its all credit we take and that will not be paid back to nature in other form than CO2 emissions. Imagine that you have to replace all the energy with hydro and renevables, but TOMORROW at 12:00 pm. That is in time constrains what isnt even exagerrated much, Just look at the charts of population and energy usage.
Proof that we will run out of the non renevables, like we have run out of dodo birds.
This is timespan encompassing one average or long lifetime of a human. 100 Years or so.
People living now in their mass will still be reproducing, while enrgy consumption rising and fossil fuel running out. One human lifetime to redevelop everything we have, inlucing societal structure and land use from scratch and make it sustainable in all its entiriety.
Renevables, geothermal could be a thing in some places. With this energy you would have to do everything, everywhere, always. There are problems where in some places you cant have that kind of production of energy with renevables, at least with current consumtion, and in future probably even more demand as we will have even more people wanting to have a share. Its a complex thing, but to say we have found a cure for that problem is too early, and if we dont find during one human lifetime, nature will fix things its own way, balance being returned anyway, only with civilization changing back to where we started technically.
Only if human evolves its body to survive or will grow everything it needs, then the civilization will be sustainable, for some time of course. Planet have around 1 to 3 Billion of years of life surviving on it anyway, if not less. Then it will be unbearable hell and a barren wasteland.
Didnt occured to you why we didnt have a multitude of spacefaring civilizations across our galaxy, living aliens even on earth, mixed origins across the biosphere? Or why there is no probes of mechnized kind anywhere coming from every place out there to us? Or alien spaceships mining already our moons, to make even more spaceships for alien races? They seem to have had enough time to develop things.
The rate of technological advance doesnt seem to suffice for any case of unlimited growth. The growth is limited only to origin planet. In our example, that we live in now, today, it seems to go exactly this way.
