do now: imagine you were this girl. write a caption that explains what she is doing in this...
TRANSCRIPT
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Do Now: Imagine you were this girl. Write a caption that explains what she is doing in this photograph?
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Turn and Talk: How would your life be different if you had to get your own water like this?
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Aim: Will we have enough usable water?
Read A Loud Colorado River
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Case Study: The Colorado River Basin
• Over tapped resource.
• 2,300 km through 7 U.S. states
• 14 Dams and reservoirs
• Located in a desert area within the rain shadow of the Rocky Mountains
• Water supplied mostly from snowmelt of the Rocky Mountains
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Case Study: The Colorado River Basin
• Supplies water and electricity for about 30 million people– Las Vegas, Los Angeles, San Diego
• Irrigation of crops that help feed America
• Very little water reaches the Gulf of California
• Southwest experiencing recent droughts
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Why would there be more dams in the lower basin?
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Aerial View of Glen Canyon Dam Across the Colorado River and Lake Powell
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• Do you understand why there are more dams in the lower basin of the Colorado?
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Enduring Understa
• Concept 13-1A We are using available freshwater unsustainably by wasting it, polluting it, and charging too little for this irreplaceable natural resource.
• Concept 13-1B One of every six people does not have sufficient access to clean water, and this situation will almost certainly get worse.
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Freshwater Is an Irreplaceable Resource That We Are Managing Poorly
• Why is water so important?
• Earth as a watery world: 71% of surface
• Poorly managed resource
• Water waste
• Water pollution
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Freshwater Is an Irreplaceable Resource That We Are Managing Poorly
• Access to water is – A global health issue– An economic issue– A women’s and children’s issue– A national and global security issue
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Girl Carrying Well Water over Dried Out Earth during a Severe Drought in India
• Many areas suffer from sever and long lasting droughts.
• Over 1.2 billion people do not have access to freshwater.
• Each day girls and women walk 4 miles and spend 3 hours collecting water from distant sources in India.
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Science Focus: Water Footprints and Virtual Water
• Water footprint– Volume of water we directly and indirectly use
• Average American uses 260 liters per day– Flushing toilets, 27%– Washing clothes, 22%– Taking showers, 17%– Running faucets, 16%– Wasted from leaks, 14%– World’s poorest use 19 liters per day
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Science Focus: Water Footprints and Virtual Water
• More water is used indirectly = virtual water– Hamburger, 2400 liters
• Virtual water often exported/imported – Grains and other foods
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VIRTUALWATER
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Virtual Water
• About how many bathtubs of water were used to provide all of the jeans and cotton shirts that you own?
• About how many bathtubs of water were used to provide you with the bread that you typically eat in a week?
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http://environment.nationalgeographic.com/
environment/freshwater/water-footprint-calculator/
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Case Study: Freshwater Resources in the United States
• More than enough renewable freshwater, unevenly distributed and polluted
• Effect of– Floods– Pollution– Drought
• 2007: U.S. Geological Survey projection – Water hotspots
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Average Annual Precipitation and Major Rivers, Water-Deficit Regions in U.S.
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Water Hotspots in 17 Western U.S. States
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Water Shortages Will Grow
• Dry climates
• Drought
• Too many people using a normal supply of water
• Wasteful use of water
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Water Shortages Will Grow
• China and urbanization
• 30% earth’s land area experiences severe drought– Will rise to 45% by 2059 from climate change
• Potential conflicts/wars over water– Refugees from arid lands– Increased mortality
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Natural Capital Degradation: Stress on the World’s Major River Basins
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Summary
• Is there a solution to prevent a future water shortage?