ch. 4.7, beginning to think globally, and ch. 4.8, global connections, pp. 74 - 77
TRANSCRIPT
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Ch. 4.7, Beginning to Think Globally, and Ch. 4.8, Global Connections, pp. 74 - 77
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Water is Essential to LifeEarth’s surface is 70% water, but . . .
98% is saltwater, and only 2% freshwater
About 3/4 of the small amount which is freshwater is frozen
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People’s Sources of Fresh Water
Rivers, lakes, streamsWells/underground water supplies
RainwaterDesalination of salt water
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“. . . At least 1 billion (people) lack a steady supply of clean, safe drinking water . . . And every year more than 2.2 million people die from diseases . . . related to unsafe drinking water.” p. 74
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Increasing Water ShortagesThe amount of freshwater stays the same,
while Earth’s population continues to grow.
China—polluted rivers, shrinking aquifers in the midst of a growing population
Egypt—dependent on Nile River; countries to Egypt’s south may affect the river’s flow
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Climate Change and Water SuppliesSome scientists believe global warming will
lead to reduced rainfall in some areas and flooding in others
Managing water supplies:Water collection and storage—if your country
has too little waterFlood control—if your country has too much!
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Factors affecting freshwater availability
Population growth
Future climate changes
Pollution of formerly safe drinking sources
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Future concerns
Increased cost of water $$$$$$$$$$$$$$$
Lower food production
Public health problems
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TAKE THE QUIZ WITH YOUR CLASSMATES!
http://environment.nationalgeographic.com/environment/freshwater/freshwater-101-quiz/
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What can we do?http://environment.nationalgeographic.com/
environment/freshwater/top-ten/
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Works Cited
http://e-iwm.wikispaces.comhttp://environment.nationalgeographic.com/
environment/freshwater/freshwater-101-quiz/http://environment.nationalgeographic.com/
environment/freshwater/top-ten/http://lutheranworld.orghttp://rashidfaridi.wordpress.comhttp://topnews.in