1. pollution
... and other, less visible, by-products into the atmosphere. Although wind and rain occasionally wash away the smoke given off by power plants and automobiles, the cumulative effe! ct of air pollution poses a grave threat to humans and the environment. A big example of smog is LA you can see the smog just hovering above the city. I don't think any human alive should ... be subject to that kind of environment. Scientists believe that all cities with populations exceeding 50,000 have some degree of air pollution. Burning garbage in open dumps causes air pollution Scientist have discovered th...
- Word Count: 671
- Approx Pages: 3
- Grade Level: High School