this post was submitted on 21 Apr 2025
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Over half of all humans as of 2020 live in cities.
Cities on average (at least in the US) have 5-15% green space compared to their built environment.
Sustainability considers not only environment and health, but also the welfare of the birds themselves.
Free range is thought to be the highest standard of welfare for bird raising. The USDA doesn't have a definition for how much acreage is the bare minimum to reach this status, but the EU defines this as 1 bird per 43 sq ft. This is compared to many plants that require 36 sq ft or less to grow.
All of this is to say that the majority of people don't have good access to sufficient land to raise their own chickens, let alone other animals for consumption or even vegetables as with community gardens.
If we want to be more sustainable with our food production, we need to look at how how our food systems work and how we can better integrate them with the places we live in via zoning and urban design. That mentality lends itself better to plant-based farming, which is more sustainable overall compared to the convention.
your last link depends on poore-nemecek 2018, a paper with dubious methodology.
How is it dubious
it's a meta study of LCA studies, but the guidance for LCA studies is that they cannot be combined because they have disparate methodologies.