Our Water Resources

ENS1023/10/2006

Review

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• How can we slow world population growth?– Improving education - literacy

• health- reproductive, physical, mental, social• family planning• employment• corporate investment in literacy in developing countries

– Family Planning• counseling• pre and post natal care

– Investing in Social Security– Economic Security (alleviate poverty)

• more jobs (especially for women)• education for employment

– Education on resource management• greenbelt movement

• What is the current world population?

Quiz

• 1. What resource is “absolutely fundamental to life as we know it”.

• 2. What % of the Earth’s water is useable freshwater?a. 0.77% b. 2.5% c. 30% d. 70%

• 3. What is a rain shadow?• 4. The greatest consumer of water in society

today is:a. households; b. industry; c. agriculture

Water in the News?

• Let's visit the library news database.

Water - ecology & resource

• De 8:7 For the LORD your God is bringing you into a good land, a land of brooks of water, of fountains and springs, flowing forth in valleys and hills, (>600)

• Why did God create water?• What is the role of water in Creation?• The anthropic principle or “the functional

integrity of Creation” principle

What role does water play for organisms?

• hydration

• growth

• cleaning

• habitat

• majority of body

• cooling

Water - ecology & resource• Most of every living organism is water.

– ≈70%

substrate concentration

0.00 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00

0.00

500.00

1000.00

1500.00

2000.00

high WATER CONCENTRATION

• Osmoregulation

• Solvent

• Specific heat

• Organismic balance

Water - ecology & resource• Most of the Earth is water.

– 71% of the earth’s surface

Water - ecology & resource• What roles does water play on Earth?

– Take 5 minutes, use your text, and make a list of the roles

• water cycle• irrigation• weather and climate• growth• energy• life sustaining

Water - ecology & resource• What roles does water play on Earth?

Water - ecology & resource• What roles does water play on Earth?

Water - ecology & resource• What roles does water play on Earth?

Water - ecology & resource• What roles does water play on Earth?

– A temperature and climate regulator• High specific heat (1 cal/g)

• High heat of freezing (80 cal/g)

• High heat of vaporization (540 cal/g)

– A weather machine in interaction with the sun.

• Water keeps the earth livable.

What role does water play for human society?

• Take 5 minutes, use your text, and make a list of the roles

Water - ecology & resource• What role does water play for humans?

– Physiological water • 2.3 liters per day

– Functional integrity of climate systems • 97.418 %

– Living water • 100 gallons/person/day (8%)

– Growing our food• 700 gallons/person/day

– Technological water - 970 gallons/person/d

Water - ecology & resource• What role does water play for humans?

– personal water

Lawns, etc. Toilets Bathing Laundry Dishes Drinking,cooking0

10

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90

100 U.S. Family of 4

Water - ecology & resource• What role does water play for humans?

– Technological water - 970 gallons/person/d

metals power agriculture mining chemical paper other0

2

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20

direct indirect

Water - ecology & resource• What role does water play for humans?

– 1770 gallons/person/day

Water Use in U.S.

Agriculture39%

Power production

34%

Industry21%

Residential6%

Water - ecology & resource• What role does water play for humans?

– 1770 gallons/person/day

Water - ecology & resource• The hydrological cycle

Principles of sustainability as related to water

• Ecosystems use sunlight as their main source of energy

• Ecosystems are built upon interrelationships not independence

• Ecosystems dispose of wastes and replenish nutrients by recycling

• Ecosystems, regulate the size of member populations

• Ecosystems, maintain (bio)diversity

For Monday

• Continue reading Chapter 7 and we will examine the state of our water resources from MN to around the world