Chapter 20: Water Pollution
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Section 1: What are the Causes and Effects of Water Pollution?
Concept 20-1A: Water pollution causes illness and death in humans and other species, and disrupts ecosystems. Concept 20-1B: The chief sources of water pollution are agricultural activities, industrial facilities, and mining, but the growth of both the human population and our rate of resource use makes in increasingly worse. Section 2: What are the Major Water Pollution Problems in Streams and Lakes?
Concept 20-2A: Streams and rivers around the world are extensively polluted, but they can cleanse themselves of many pollutants if we do not overload them or reduce their flows. Concept 20-2B: Adding excessive nutrients to lakes from human activities can disrupt their ecosystems, and prevention of such pollution is more effective and less costly than cleaning it up. |
Section 3: What are the Major Pollution Problems Affecting Groundwater?
Concept 20-3A: Chemicals used in agriculture, industry, transportation, and homes can spill and leak into groundwater and make it undrinkable. Concept 20-3B: There are both simple ways and complex ways to purify groundwater used as a source of drinking water, but protecting it through pollution prevention is the least expensive and most effective strategy. Section 4: What are the Major Water Pollution Problems Affecting Oceans?
Concept 20-4A: Most ocean pollution originates on land and includes oil and other toxic chemicals, as well as solid waste, which threaten fish and wildlife and disrupt marine ecosystems. Concept 20-4B: The key to protecting the oceans is to reduce the flow of pollution from land and air and from streams emptying into ocean waters. Section 5: How Can We Deal with Water Pollution?
Concept 20-5: Reducing water pollution requires that we prevent it, work with nature to treat sewage, and use natural resources far more efficiently. |
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