Comments by "" (@kaitlyn__L) on "City Beautiful"
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efficiency is higher, sure, but internal combustion engines still lose 60-80% of the energy to heat... so that's still not great compared to trains which are almost universally electrified for cities and commuter routes, and electric motors are 90-98% efficient. plus the optimal speed is rarely reached outside of a segregated fast highway (aka motorway or freeway or autobahn) so that argument is pretty irrelevant for city driving, which is usually 20-30mph. certainly driving a highly aerodynamic vehicle with a small engine will do far more for efficiency than trying to drive the same car fast all the time. and auto-start-stop turns off an engine completely when stuck in traffic. i know it used to take up to 5 seconds to fire up the engine again, but the car i learned to drive in was a 2020 model with the feature and now it takes less than half a second, easily the engine was up and running again quicker than i could take my foot off the brake and onto the accelerator. basically even if driving is still common and still based on burning fuel, there are many better mitigations than trying to avoid stopping the car at all costs, even by doubling the person's commute distance. after all, if a person who got 30mpg suddenly had half the distance to drive, at a crude calculation they would use the same fuel as if they'd switched to a 60mpg car for the same distance. mpg is measured in distance, not average speed, after all. it's also worth noting many engines don't have a linear relationship between mpg and co2/mi, the lower fuel economy also generates many multiples the same co2 per engine mile on average, in most cars. even when the engine is physically the same, but tuned to product more power in the ECU. i know not everybody wants to live in a city, some can't stand hearing any traffic noise at all, or need to see a forest and birds out of their window. but certainly we should make city living easier, safer and more convenient for people who live there, and enabling walking journeys and quick subway or bus connections makes that much easier (and accessible to all teens) than driving – which absolutely has its place in a city, even the best public transport system still isn't suitable for many disabilities, either you need to carry too much equipment with you or the nearest station is still just too far from your house bc of the disability, or whatever - so there will always be some place for cars in cities, as they'd be breaking disability accessibility legislation otherwise. but i don't believe cars need to be a first class citizen in dense city cores, and i'm personally happy to wait at traffic lights, knowing each person crossing the road is potentially one less car sharing the road with me, and making my journey less crowded and more pleasant as well. easily worth 2 minutes at some traffic lights. (plus if you have a shorter distance to travel, even in a car, you're going to deal with fewer traffic lights.)
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I'm perfectly content staying in my modern build apartment... the kitchen is much larger than, say, a terraced house from the 40s-60s would've been, and many people are still living in those passed down from their parents. Yes they have a garden, but I prefer warm and quiet anyway. I've never overheard my neighbours doing anything except for occasional drilling and hammering now and then. I live a quarter of a mile away from a convenience store, so it's easy to pick up essential groceries without straying too far. I'm just happy there's been no post for weeks! Usually there's a ton of junk mail – a problem no matter where you live! Plus I still have a great view of the city from high up, and can watch various lorries, emergency services vehicles and so forth make their way through the empty streets. I'm actually thoroughly enjoying it. I dunno man, it's fine if you'd personally find it hellish to go without a garden or whatever, but... any apartment block built in the last 20 years is probably better sound insulated than any thin wooden American 50s house.. my floor is perfectly level, which is nice for laying round things on a table... my water pressure is great because there's a pump in the basement supplementing the mains pressure... I could go on. Certainly to characterise all dense housing as slums is wildly inaccurate, hell, just look at the price some people pay for them in places like New York and London. There are poorly maintained and overcrowded apartment blocks, mainly from the 60s and left to rot, but there are plenty of people crammed into houses too small for them too, in poorer neighbourhoods or regions that were deliberately cut off from the local area (such as Easterhouse in Glasgow, which had a lot of 2 and 3 storey houses, and a few apartment blocks). The density of the housing doesn't really affect whether or not a place will be neglected and turned into slums or not, building owners and absentee landlords decide that. As for the current coronavirus, being separated from the apartment across the hall from you or the house across the street from you really makes no difference, you're both sealed up in your own home anyway?
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@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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