When you see a nicely cut lawn stretching from your feet to the base of a building, you should not let your mood be pacified by the sight, but rather you should see the dark consequences of the grass amputations: destruction of native habitat for animals, injuries to people, and ugly pollution of all kinds.
Cutting the grass reduces the leaf area per area of ground; thus, there is less plant conversion of CO2 to Oxygen.
A variety of animals need tall grass for a habitat. Civilization needs to minimize its impact on the environment.
Draconian laws across the country force people to cut grass (some carry jail time). These are first amendment infringements on freedom of expression. Not everybody likes carpet.
So many people get hurt by lawn equipment that almost everybody has a story of an injury, and little kids are disproportionality victims. They play in the yard, and adults doing mowing aren't conscientious enough or responsible enough to keep them out of the way.
An enormous amount of gas and oil are spilt every year (as much as was spilt from the Exon Valdez) because pouring small quantities is inherently sloppy.
Two stroke engines often used in lawn cutting equipment (weed whackers for example) are particularly bad in terms of pollution. And small four stroke engines are only somewhat better. (An hour of average mowing is equivalent to an hundred mile drive in a typical car.)
All of these problems could be solved simply by not cutting the grass. And the dubious benefit from cutting grass is only visual.
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