Chapter 4 Summary

Although the majority of the earth’s surface is covered by water and all human life depends upon it, this precious natural resource is in short supply. Most of the earth’s water contains too much salt to be used for drinking, so only a finite amount is available for human consumption. In fact, the quantity of safe drinking water is limited and rapidly decreasing. Some areas of the world already face critical water shortages while other areas will soon be confronted with a life-threatening depletion of potable water.

Rather than preserve and protect the earth’s water supply, however, mankind has contaminated it with pesticides and chemicals. According to the text, the culprits are many. Water pollution is the...

(The entire section is 515 words.)