Agricultural expansion into forestland is the primary cause of tropical deforestation. ... Chemicals from waste dumps in some metropolitan areas are draining into backyards. Pesticides are leaking through the soil into drinking water wells in our agricultural belts. ... Refrigerators were designed to cool, but their coolants seep into the atmosphere and thin the Earth's protective shield. Americans want clean air, yet few are enthusiastic about the inconvenience of automobile exhaust inspections. ...

• Word Count: 700
• Approx Pages: 3
• Grade Level: Undergraduate