Warm Up 10/19 • Fresh water is used for which of the following? a. growing food c. drinking b. cooking d. all of the above • What amount of Earth’s total water supply is usable fresh water? a. less than 1% c. 75% b. 25% d. 50% • 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
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
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 products
Assignment • 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 Tuesday/Wednesday!