And a nice serving of
QED
LOL!
In addition to improving the market value of individual homes and the surrounding neighborhood and communities, well maintained lawns, like all living plants, capture carbon dioxide and release oxygen.
Lawns also trap stormwater runoff, improve soil structure for the growth of trees and other plants,
reduce noise pollution, keep you cooler, and may save money on energy costs.
Clippings are also great for creating a compost rich in nitrogen for fertilizing gardens to grow food or flowers etc.
And of course do not forget the value of grass for livestock feed and other animals.
And, of course,grass provides a natural ground cover for recreation
You seem rather naive about these assets of lawns.