Here are the things I think are important to know:
1. For thousands of years we never had more than 1 billion people on earth ever.
What changed this?
2. Farm tractors run on Diesel or gas processed from Oil which came from dinosaurs, animals and plants and people that have died during the last millions of years and sunk underground.
So, what happens now?
3. Either we reduce human populations to 1 billion or all animals and humans go extinct within a few hundred years.
OR:
4. we move underground and leave the surface of the planet to farming and recreation ONLY.
How many people could theoretically live on earth if the surface was ONLY used for farming and recreation?
5. I'm thinking that we might be able to feed 13 to 14 billion people IF we only lived underground and left the surface available ONLY for farming, recreation, National or International Parks and the Like.
6. Also, when you move underground you no longer have the heating bills or have to burn so much wood or gas or coal or whatever to keep warm because underground (anywhere under 1 to 2 feet of earth stays pretty constant temperature wise.
7. However, you do have to bring fresh air underground so you have enough oxygen underground to live well.
8. Also, it is possible to have most of your home literally above ground by making it of cement and making the roof 2 or more feet thick of dirt and grass or even trees above the cement roof. In this way you could have windows that were thermopane ( two or three layer windows with enough dead air space to keep heat (or cool) inside your home.
By modifying the way we live through solar cells, living underground and reclaiming all above ground land for farming and recreation we could likely increase our populations as high as 13 to 14 billion worldwide.
9. But, this ONLY works if we move underground.
10. So, unless this is the direction we are going to go in we are going to have to choose between the deaths of 7 billion people (leaving 1 billion alive) or we have to move underground Or we all go extinct here on earth along with all other animals and plant lifeforms.
11. It is quite possible that humans will die and other types of lifeforms will emerge than us here on earth too. For example, things that need less oxygen than human beings still will be alive here on earth even if we overpopulate ourselves to death here on earth.
12. But, we are also killing the oceans through overfishing and global warming. So, soon there will be no fish to obtain out of the oceans. Bluefin Tuna are already on the edge of extinction here on earth, for example.
13. Without plankton and diatoms oxygen will greatly reduce both in the air and in the seas leaving only trees and plants on land to turn carbon dioxide into Oxygen for humans to breathe.
14. So, keeping plankton and diatoms and trees and plants alive is a life or death matter for humans even now.
15. So, moving underground we can keep more animals, plants and trees alive on the surface so we can continue to breathe oxygen in the air so humans don't just eventually all suffocate from lack of oxygen. So, even if the seas die and the plankton dies and the diatoms all die as long as we have trees and plants near us we can still breathe and think and farm and live.
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