Malthus vs. reality
posted by Shalashaska
I was referring to space-colonies, ring-worlds, Dyson spheres or colonization of the moon or Mars. Only once people live in space will space technology really take off.
Seems likely. People like the Polynesians who live on islands become the world's best sailors. People who live among the stars will have the best spaceflight.
But still it becomes an issue of capacity. The whole reason for considering off-world migration (at least on this thread) is the fact that an entire
planet can barely support six billion people. How could we ever build enough
spacecraft to support them?
Throughout history, colonies have been characterized by low populations -- at least of the invading people, not the victims. The same will be true in space.
posted by Pollux
There's a scenario that was feared awhile ago...I think it's called "The Malfusian Scenario," or something like that.
It's "Malthusian," named after Thomas Malthus, a serious pessimist of the late 1700s.
It states that the greatest fear of mankind should be the depletion of resources, that our population will grow to such heights that we will begin to fight over what little food, gas, and whatever is left.
I read a report about forty years ago -- when Malthus's predictions still seemed valid -- that I've got on a hard copy somewhere. I'll have to find it, scan it, and upload it. Anyway, it dispassionately calculated the carrying capacity of the Earth to be around ten trillion people. That involved:
- Per capita living space quite a bit smaller than a computer programmer's cubicle.
- Several times that much space for pumping food (how yummy), water, air, waste, and information, plus what will seem at the time like adequate room for horizontal travel but very limited vertical travel.
- The entire globe, including what are now oceans, covered with contiguous warrens of these cubicles, about five miles deep.
- The top layer covered with algae (that is what the humans will call "food") factories and the handful of zoos containing the few remaining non-human animals that the few remaining environmental activists manage to preserve.
- Massive solar energy collectors in orbit compressing it into microwaves beamed at a planet-wide network of microwave receivers scattered throughout the algae factories.
As the author put it in one of his many passages of dry wit that I remember clearly, most humans will have virtually no work to do. However, they will be well entertained. At any moment the population will include several million Shakespeares, and rather more Beatles.
The limiting factor will be waste heat. The planet will become one uniform ecosystem that consumes energy in the visible spectrum and releases it as much lower-spectrum heat. Entropy run rampant.
Basic physics limits the rate of the planet's ability to radiate the waste heat. Despite climate control in the warrens, the temperature will rise as the population increases. An ever-increasing portion of the population will not be able to survive the heat. The survivors will adapt and continue to reproduce, but it's unlikely that the human animal will ever be able to live in an ambient temperature much greater than 125 degrees Fahrenheit. At that point the die-off rate will exactly balance the birth rate and the population will stabilize.
A few calculations involving basic thermodynamics -- all using the most favorable scenarios in deference to the optimists -- and presto, the maximum population figure of ten trillion. If the population continued to double every thirty years, as it was when the article was written, that figure would be reached in just a few centuries. This is just a more generalized and disciplined version of the greenhouse gas scenario.
Nonetheless, it was then considered possible that the technologies needed to support this growth and this transformation of the planet into a giant arcology could be developed and deployed at the rate needed to match the population growth. Nothing in the final scenario was beyond the reach of 1960s science.
There you go. People adapted to tolerate constant temperatures higher than Death Valley at high noon in August, living like hamsters, drinking liquid Soylent Green, never seeing another species of animal larger than a rat (the article didn't count them, but let's face it, they will always be with us), living a meaningless existence sitting at a workstation with no work.
That is the mid-20th Century recalibration of the Malthusian Doctrine.
I'm confident that that will never happen. We will either destroy ourselves, be destroyed by something (or someone) else, or, perhaps, billions and billions of years from now, we will witness the end of the universe. Or whatever the hell we are will witness the end of the universe.
Or, as you seem to imply earlier in your posting, prosperity will save us and the population will start shrinking while the rain forests are still salvageable and before too many more species become extinct.
This is an awesome thread. I'll be back.
"Be back"? You don't have to come back. You're living it!
