Earlier quoted context omitted.
> You don't get less environmental impact by having every person take up more land. Urban living is much more environmentally friendly because the alternative is paving over more of the environment. It's not about how much land a person uses, it's how that land is being used. Nobody sitting on a 5 or 6 acre lot in the middle of hickville is going to build one house and pave the rest with asphalt. Urban living is "pav…
I guess the misunderstanding comes from the fact that you consider a garden "environment/nature". And the parent commenter does not consider a garden "environment/nature". Nature in general is important because it creates biodiversity and space to roam. Forests in particular are sequestering CO2 and are producing oxygen. The average garden behind a detached house does approximately none of that.
It's cities that depend on gardens and parks to serve as the only available "nature". Rural areas are filled with forests and woods and grasslands and support far greater numbers and varieties of wildlife than cities do.
We could decide to pack people like sardines into the smallest possible space, completely destroy the local ecosystem in the areas where we live (allowing the pollution to spread outside of our overcrowded cities the same way China's pollution currently crosses the ocean to fill the skies in California), while also suffering the countless costs to our own health and safety those conditions cause in the process just so that we can have vast expanses of polluted but undeveloped land that no human can use for anything, but I propose something a bit more balanced, where we spread out enough so that the biocapacity of the land we settle on isn't exceeded, but still near enough to each other that we can still efficiently sustain a civilization. That means a population density that isn't overcrowded, but not so far apart that we lose all of the efficiencies we gain by living near each other. I'd much prefer to have biodiversity within the places we inhabit and keep space to roam for humans as well as the other animals.