Comments by "" (@kaitlyn__L) on "How big can cities get?" video.

  1. London is already like that, takes a few hours to go across it, people identify strongly with their local borough. But the citywide infrastructure keeps it feeling cohesive enough too, like he said in the video. For example going from Leyton, which feels like a sleepy suburb, into the centre of London, is basically akin to going from a small town to the small city 20 minutes' drive away. People already live like that, and plenty of them consider themselves Londoners, despite also strongly identifying with their borough.
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  2.  @chungonion  driving across Dallas fort worth is already kinda like that lol
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  3.  @shotelco  yeah, I'm all about tying together municipal services to improve efficiency. District heat for example brings the efficiency of a turbine power station from 40-50% into 80-90%, and removes the need for individuals to deal with boilers/furnaces in their own homes. Proper planning absolutely is essential for maximising efficiency going into the increasingly-electric future.
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  4. what is this "2-4x the energy in wastewater" about? flow rate? if so, that's mostly still coming from pumps. by all means recover some of it, like regeneration braking on a car, but it wouldn't be free energy.
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  5.  @shotelco  oh okay, biofuels from the decomposition. (gonna be honest, I skimmed most of your comment because I'm already extremely familiar with the chemistry there.) I guess that applies more to blackwater than greywater, which is what I was thinking. In the UK, "wastewater" is usually close to greywater, while the blackwater we would tend to call "sewage". So that's why I had trouble imagining where the energy lay. But, like, fair enough. I'm all for biogas from food and farm waste. Collecting the solids from sewage treatment and putting them into the digesters seems like a decent idea, I guess. Like, I'd certainly prefer to burn bio-methane instead of north sea gas or shale gas. Especially if the methane would otherwise go into the atmosphere, since it's more insulating than the CO2 it releases. But in the longer term, I would suggest sequestering the methane from sewage, when we don't need it for the energy.
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  6.  @dannydawson701  but also, London
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