How about reducing energy consumption?

Pittsburgh pledges to become a 'dark sky city'

https://www.ksby.com/news/national/pittsburgh-pledges-to-become-a-dark-sky-city-in-2022

Pittsburgh will become a "dark sky city" this year. It's common for smaller localities in the western U.S., but not for cities of Pittsburgh's size and for cities on the East Coast.

Pittsburgh says it will switch to lower-wattage LED streetlamp light bulbs to reduce light pollution.

"Light pollution severely affects the natural environment pollinators, and bird migration, fireflies," said Diane Turnshek, a special lecturer in the Carnegie Mellon University physics department.

The city also says the move will increase energy efficiency. They expect to replace around 40,000 streetlights, which will reduce overall energy consumption between 40-50%.

"Street lighting is a major component of our electrical bill and of our emissions footprint, and so when we think about those correlations between energy consumption, the types of energy that we're consuming, as well as the amount of reduction, it'll be a pretty significant consumption reduction that we'll see," said Grant Ervin, Pittsburgh's chief resilience officer.