theseducer wrote...
The world isn't truly over populated,its just we have been quite lazy in terms of expansion in the last 50 years. If you look at most countries including the united states, not even 50% of their land is used, usually over 90% of said land isn't used. If it ever gets to the in which we cant occupy land on the surface of our earth, there is the water, ground, and the sky (settling on other planets included. We will build floating cities and communities, possibly levels of cities which go far beyond the skyscrapers of today, we will live in hospitable deserts and tundras which we wouldn't be able to sustain ourselves in without technology. If we every truly reach our pinnacle of settlement with and upon our earth, the next best thing would be city-state satellites and planet settlement.
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I disagree with your premise that "overpopulation" is a problem of occupied space.
I find it to be a factor of, enough resources, to support a status higher than "struggling for food and warmth every night".
-Large amounts of land can't be used for farm land due to them being inhospitable and unsupportable of the necessary conditions.
-More animals to support every individual is not possible with the requirement in land capacity necessary to raise them and food quantity required to support them.
-That quite a large amount of "open space" is unused for difficulty of being able to occupy, or increasing the imposition already established on nature by humans.
-Additionally, cultural and political restraints would abhor the idea of sharing their boarders, say with China for instance who would need it most at this point.
-Monetary exchange, as much as I hate it, nothing changes without.
-Intelligence and communication.
-War and conflict.
-These things have to last for an extended period of time.
-Alternative sources of energy that can last longer.
-We can't damage our natural resources more than necessary.
-Our techniques have to support the growth of population increases which are proportional to advancements in technology. Wiki "...global population expected to reach between 7.5 and 10.5 billion by 2050." Though I know nothing of the science used to factor this. Interesting statistic found
wiki of Europe growth from 1800's to 2100.
-ect.
The following are all problems I considered in your concept of alternatives.
Water requires resources from the land to support, and creating multiple huge cities on the sea that can support, say 300,000,000 (America's population), would take extensive amounts of time and resources barely available from natural and existing sources.
-There would be huge problems with enforcement and protection in such a small space.
-Transportation of resources, given fossil fuel has a limit.
-More efficient water filtering system, considering there water and waste end's and begins in the same place.
-Lack of an ability to be completely self sufficient.
The biggest problem in using space is necessary fuel and funding.
-22k per kilogram.
-Each additional thing added to the space crafts load increases the required fuel necessary to get it into space, alone.
-Sending enough individuals to make a scratch in the global population alone is difficult.
-Space colonies can't support self produced oxygen and food (might be wrong on oxygen, I have to read an article on how this guy intends to support his crew on mars for 2 years).
When you say ground do you mean "underground"?
-Problems would be oxygen sources.
-Further underground you go, the hotter it gets, Russia's Kola Superdeep Borehole which made it to 12,262m and reached 180°C (356°F), there's also KTB Superdeep Borehole that reached 9,101m but 260°C (500°F) temperatures.