And we already consumed most of the easily available resources, and used them to build up the infrastructure that we’re currently using to get the hard to reach stuff. So that means not only is the loss of our comfortable place going to be permanent on any conceivable human historical timescale, but if we lose the current industrial base, then we probably won’t be able to develop another one in another geologic age, however much time goes by, if the species survives on our changed and shattered world.
If we lose what we have today, it will slip down and away and escape from our grasp, probably forever.