As part of this planet, we should find some type of solution for what causes global warming. ... There are two types of hydroelectricity dams called dams and run-of-river, or water-diversion. But both types of dams have serious environmental effects. ... But in return air, chemical, water, or thermal pollution would not be present" ("Wind, Water, Sun, or Coal"). ...

• Word Count: 3357
• Approx Pages: 13
• Grade Level: High School