Timeline for How would a completely urbanized city-planet support its population?
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9 events
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| Oct 3, 2014 at 6:14 | comment | added | fluffy | @congusbongus actually I've thought of a better way of determining what the overall O2/CO2 exchange rate would be and ideally figuring out what the equilibrium would become. At some point I'll probably do the math in earnest. :) (Not right now though.) | |
| Oct 3, 2014 at 5:47 | comment | added | fluffy | @congusbongus My understanding (probably flawed) is that the sensation of suffocation is due to the CO2 concentration but that survival is due to the O2 concentration. I'll happily edit my answer if this is wrong, though. This is all purely speculative anyway. I do think that a 1000x increase in population would still cause problems for the O2/CO2 levels regardless of how much of an algal bloom occurs though. | |
| Oct 3, 2014 at 5:25 | comment | added | congusbongus | @fluffy CO2 suffocation is independent of oxygen concentration. Human respiration would contribute a small fraction of the current ~400ppm CO2. You do also state that algae (and many plants) will thrive and produce more O2 under high-CO2 conditions. | |
| Oct 3, 2014 at 5:18 | comment | added | fluffy | @congusbongus It was a WAG based on the assumption that a planet with 7 billion humans have 0.04% CO2 in the atmosphere would scale more or less linearly. It wasn't intended to be particularly scientific. And, is that 10% suffocation based on still having another 21% oxygen, or is it based on 10% CO2, 10% O2, and 79% N2? | |
| Oct 2, 2014 at 10:40 | comment | added | glenatron | A lot of sci-fi anticipates vat-grown meats as a way of feeding urban planets. We might also anticipate micoproteins and even possibly invertebrate food sources - perhaps the insects feed on waste materials and there then themselves ground up into delicious protein pills. | |
| Oct 2, 2014 at 3:13 | comment | added | congusbongus | Why do you think CO2 will rise to 21%? By the way, 10% will suffocate humans already. | |
| Oct 2, 2014 at 2:46 | review | First posts | |||
| Oct 2, 2014 at 3:21 | |||||
| Oct 2, 2014 at 2:42 | comment | added | neph | Related:worldbuilding.stackexchange.com/questions/811/… | |
| Oct 2, 2014 at 2:41 | history | answered | fluffy | CC BY-SA 3.0 |