[cm2187]

Well, Japan hasn't seen population growth.

I have a lot of sympathy for deregulation and think it should be the primary tool, though many cities also have a character and you can't replace every construction with a high rise building without destroying the city. Think of Paris or London.

[arcticbull]

> Well, Japan hasn't seen population growth.

I don't know why this is everyone's immediate reaction. I'm saying housing is governed by supply and demand. If you want to drop prices you can either increase supply or decrease demand. They allowed supply to meet demand by increasing supply into flat... ish demand. ([edit] SF and Tokyo both grew ~10% from the mid 90s). So the system works :)

> I have a lot of sympathy for deregulation and think it should be the primary tool.

Great me too.

> ... though many cities also have a character and you can't replace every construction with a high rise building without destroying the city. Think of Paris or London.

Think of Hong Kong. A wonderful city. It's very different from the 50s when it was basically the same height as SF. I don't think anyone misses that. ([1] before, [2] after - I'd hardly call that ruined).

Yes, construction will change the character. But so what? Look at SOMA. Do you miss the old warehouses? I don't. And I certainly wouldn't miss the mishmash of almost identical 4 story buildings in the Sunset. They ain't no painted ladies is all I'm saying. Or much of the Mission. Honestly the entire SF affordability crisis would disappear if the Sunset was zoned 6 story instead of 4.

Embrace change!

[1] https://www.mardep.gov.hk/theme/port_hk/en/p1ch6_1.html#

[2] https://en.wikipedia.org/wiki/Victoria_Peak#/media/File:Hong...

[ericmay]

Hong Kong is a fragile anti pattern of artificially high density enabled by fossil fuels. We don’t want that (though it’s less bad than the suburbs, but just barely).

What we need to continue to strive for is medium density, where you have a mix of housing types and transit options, and also work options.

In this mode you have a good density level that is in harmony with the surrounding environment, but you can also do things like fix your own house or make changes or improvements. These types of neighborhoods also offer multi-generational living and better social interactions.

[arcticbull]

In terms of carbon footprint, Hong Kong is actually very good.

2021 is showing about 4.37 metric tons per capita, and if you assume the rough contribution of power remained constant after 2011 ([1]) the overwhelming majority of that continues to be simply their almost complete reliance on coal, natural gas and oil power. If you exclude power, the per-capita CO2 emissions are around 1.6T

For comparison the lowest CO2 footprint city in the USA is New York at 5.38 and second-highest is San Francisco at 7.12 [2].

The HK figure is from 2021 while the US figures are from 2019 so that's not entirely fair. In 2019, HK had roughly 6T per capita CO2 emissions, putting it directly between NYC and SF - the two lowest emitting cities in the US.

With respect, I do want that! I want that very much.

[1] https://www.worldometers.info/co2-emissions/china-hong-kong-...

[2] https://www.magnifymoney.com/news/cities-with-largest-co2-fo...

[ericmay]

Do these emissions take into account emissions caused by building the structures? Just curious as I really don’t know or know if it would make a difference.

Certainly if we wanted to minimize carbon footprint, something like Hong Kong is probably the best we can do right now, but at the same time residential homes have more capacity to add solar and to do things like repair their own home or open the windows to let a breeze in. I guess what I see is the fossil fuel based infrastructure that’s required to build and maintain these large skyscrapers that is of concern. Skyscrapers are monolith.

Aside from that though I also think mega cities are a little bit fragile in their centralization versus something more akin to Europe (and similarly elsewhere) where you have towns and villages and farms with local producers. They also IMO are not as psychologically healthy as compared to smaller towns or smaller, less ominous cities landscape.

[arcticbull]

Almost certainly not, I can't imagine they'd include amortizing the CO2 emissions of the concrete used in construction (which is to your point staggering). I have a better understanding now of where you were coming from in your post. I'm optimistic for the future of wooden skyscrapers [1]. Maybe as high as we can get them is the optimal limit for density?

[1] https://www.wsj.com/articles/wooden-skyscrapers-are-on-the-r...

[ericmay]

Appreciate the great conversation! I fundamentally don't like the idea of having skyscrapers as the goal versus medium density/mixed use but if we are going to build them for sure a sustainable material seems to make sense.

Typically I'd say maxing out at 3-4 stories would get us to where we need to be, although certainly something like a hospital or special use building would/could be taller.

[dmitriid]

> you can't replace every construction with a high rise building without destroying the city. Think of Paris or London.

There's a living example of that: Stockholm. They destroyed the center of the city in the 50s-60s and replaced it with high-rise buildings and a highway [1] [2]

They botched it so badly that you can't even properly see the city hall the way its architect intended.

[1] https://goo.gl/maps/q8wxq3UWvSU5yDmD8

[2] https://goo.gl/maps/7uVYivYFQvmpWVGR6