According to Utah’s Governor Office of Economic Development, Utah has “the nation’s highest fertility and birth rates, highest life expectancy rate, and highest net in-migration rate”
Utah is currently building an astonishing number of new homes, many without hardly any serious thought towards sustainability. We are building on top of old farm land that could have been used to make the communities more self sufficient, but which we are simply building over to put giant new houses which are too distant from any necessities of life for it to be reasonable to walk to them. These are less sustainable than homes created through smart urban planning and efficient design.
Just about every suburban home has its own front and back yard lawn, largely made up of a grass, which takes significant maintenance with little benefit. If you use when you go outside, chances are that you do so relatively rarely, generally you spend less time enjoying the lawn than you do simply taking care of it. These facts make lawns a relatively good candidate for being a shared resource among many people rather than having one per every few people. This would cut on maintenance costs, including cost of water, and water usage in general, which becomes more and more of an issue the more people there are.
Longer distances require faster forms of travel in order to go to and from in reasonable amounts of time, and these forms of transportation are usually carbon intensive, e.g. cars. So what if all the necessities of life were located near enough for you to walk to them in reasonable amounts of time? Shorter distances to necessities allow for less energy intensive forms of travel, including cycling and walking.