Not that I will be around to collect, but I would be willing to bet money that in 50 years a substantial percentage of the human race will live underground.
The environmental movement is such that they think the weather is going to kill us and that mankind is destroying the planet’s ecosystem. Eating animals will soon be considered by a majority of the world to be akin to murder.
Of all the disasters that can wipe out humanity, nearly all can be survived by being underground. Solar flare - check. Nova of a nearby star - check. Giant asteroid or comet - check. Monster volcano - check.
We are not going up, but under.
I would be willing to bet money that in 50 years a substantial percentage of the human race will live underground.
A friend that started as a carpenter, then a residential builder... good size general contractor, says the problems are almost related to water.
Roof leak, plumbing leaks, basement leaks...
Just guessing that all the below grade activity will find new water problems.
All the waste and groundwater will need to be pumped out with increasing pressure and problems with the depth.
Lower heating and cooling costs, but where will you dump all the spoils from the needed excavation?
Kind of doubt it can all be CRUSHED into a useful product?