是什么导致了无家可居者数量增加？他们有多少人？他们需要什么？我们能做什么？

资料：

Zoning law

https://www.theatlantic.com/business/archive/2015/11/zoning-laws-and-the-rise-of-economic-inequality/417360/

Food Not Bombs

https://scholarsbank.uoregon.edu/xmlui/handle/1794/11179

Homeless report

https://hsh.sfgov.org/about/research-and-reports/pit-hic/

Homeless in SF

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