If cities and towns become reconfigured to allow and encourage people to live near their workplaces, as things used to be in The Oldenne Days, more of us will be able to walk to work. (Wish I could! I used to be able to, when I was younger and didn't need the exercise so much.)

The increased exercise may have the side effect of reducing the obesity epidemic, and also improve cardiac health, which will reduce the need for certain drugs and medical procedures, which all need plastics and drugs, much of which are produced using petroleum products. Thus: additional savings.

"This is the house that Jack built..."

or, maybe:

"For want of a nail, the shoe was lost..."

That Mother Goose sure knew her social and economic trend theory.