Ch 4 4 Protecting Resources

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Transcript Ch 4 4 Protecting Resources

Warm Up 10/19
1. Fresh water is used for which of the following?
a. growing food
c. drinking
b. cooking
d. all of the above
2. What amount of Earth’s total water supply is
usable fresh water?
a. less than 1%
c. 75%
b. 25%
d. 50%
3. Which of the following products do petroleum
resources provide in addition to energy?
a. cardboard
c. aggregate
b. plastic
d. Nickel
Answers: 1) d. 2) a. 3) b.
Protecting Resources
Chapter 4, Section 4
Keeping Water Clean and Safe
• Conservation – the careful use of resources
• Starting in the 1970s, the federal government
passed several laws to prevent or decrease
pollution and protect resources
• America’s polluted rivers and lakes got early
attention when the U.S. Congress passed the
Clean Water Act (CWA); the percentage of
surface waters safe for fishing and swimming
increased from 36% to 62% from 1972 to the end
of the 1990s
• The Safe Water Drinking Act of 1974 helped
protect drinking resources
Clean Water Act Scorecard
Concept Check
• What did the Clean Water Act do?
• Led to an increase in sewage treatment
plants; it requires industries to reduce or
eliminate point source pollution into
surface waters
Protecting the Air
• In 1970, Congress passed the Clean Air Act, the
nation’s most important air pollution law
• It established National Ambient Air Quality
Standards (NAAQs) for six “criteria” pollutants
known to cause health problems—carbon
monoxide, ozone, lead, sulfur dioxide, nitrogen
oxides, and particulates (fine particles)
• Between 1970 and 2001, the emissions of the six
criteria pollutants regulated under the Clean Air
Act decreased 24%
• Energy conservation is an important air pollution
control strategy
Air Sampler
Concept Check
• What did the Clean Air Act do?
• Established six criteria pollutants and
required communities to not exceed certain
levels of pollution for these pollutants
Caring for Land Resources
• Protecting land resources involves preventing
pollution and managing land resources wisely
• Farmers now use many soil conservation
practices to prevent the loss of topsoil and
preserve soil fertility
• Selective cutting conserves forest resources
• Some farmers and gardeners now use less
pesticides and inorganic fertilizers to decrease
chemicals in soil and on crops
• Compost – partly decomposed organic material
that is used as fertilizer
• Recycling – the collecting and processing of
used items so they can be made into new
• Read Ch. 4, Sect. 4 (pg. 113-116)
• Do Section 4.4 Assessment #1-7 (pg. 116)
• Study for Unit Test (chapters 1-4) Next