Water covers 70% of Earth’s surface, yet the authors state that "The single biggest water problem worldwide is scarcity." Defend the authors’ assertion that water scarcity is a problem now, and explain why it will intensify in the future?

Current Version

Answer:

Most of this water is salt water and usable freshwater is much more rare. Increased demands and climate change are predicted to increase scarcity.

Explanation:

The Oceans cover vast areas of the globe but the salt water in these oceans is not useable for either drinking or irrigation. There are many fresh water lakes, notably the Great Lakes of America and Canada, the water in these lakes must be filtered and cleaned before the water can be used for human consumption.

Many rivers are used not only for drinking and irrigation but also for the disposal of waste products. The human waste is dumped into the rivers making the water downstream unusable until it has been treated.

There is a limit amount of usable fresh water. Much of the water has
been polluted and will become more polluted. At the same time the human population of the world is increasing, increasing the need for fresh water. The scarcity of fresh water will only increase in intensity as the demand for fresh water increases.

The image below shows water stress by country:
http://www.wri.org/blog/2013/12/world’s-36-most-water-stressed-countries

Prediction of future water scarcity:
http://www.wri.org/blog/2015/08/ranking-world’s-most-water-stressed-countries-2040
Changes in temperature , precipitation patterns (both due to climate change), and increase in demand are all drivers behind projected increased scarcity.

Edit History
  • Kate M.
    @kate Kate M. updated the answer.
    1 month ago
    Changes | Side by side
    The assertion should read the scarcity of drinkable fresh water is serious world wide problem. The Oceans cover vast areas of the globe but the salt water in these oceans is not useable for either drinking or irrigation. There are many fresh water lakes, notably the Great Lakes of America and Canada, the water in these lakes must be filtered and cleaned before the water can be used for human consumption. Many rivers are used not only for drinking and irrigation but also for the disposal of waste products. The human waste is dumped into the rivers making the water downstream unusable until it has been treated. There is a limit amount of usable fresh water. Much of the water has been polluted and will become more polluted. At the same time the human population of the world is increasing, increasing the need for fresh water. The scarcity of fresh water will only increase in intensity as the demand for fresh water increases.
    Most of this water is salt water and usable freshwater is much more rare. Increased demands and climate change are predicted to increase scarcity. The Oceans cover vast areas of the globe but the salt water in these oceans is not useable for either drinking or irrigation. There are many fresh water lakes, notably the Great Lakes of America and Canada, the water in these lakes must be filtered and cleaned before the water can be used for human consumption. Many rivers are used not only for drinking and irrigation but also for the disposal of waste products. The human waste is dumped into the rivers making the water downstream unusable until it has been treated. There is a limit amount of usable fresh water. Much of the water has been polluted and will become more polluted. At the same time the human population of the world is increasing, increasing the need for fresh water. The scarcity of fresh water will only increase in intensity as the demand for fresh water increases. The image below shows water stress by country: ![http://www.wri.org/blog/2013/12/world’s-36-most-water-stressed-countries](https://d2gne97vdumgn3.cloudfront.net/api/file/nsqnyJecTvqNo31jkquF) Prediction of future water scarcity: ![http://www.wri.org/blog/2015/08/ranking-world’s-most-water-stressed-countries-2040](https://d2gne97vdumgn3.cloudfront.net/api/file/pSqKqBYnQziIqkCalTDM) [Changes in temperature](http://nca2014.globalchange.gov/report/our-changing-climate/future-climate-change) , [precipitation patterns](http://nca2014.globalchange.gov/report/our-changing-climate/precipitation-change) (both due to [climate change](https://socratic.org/questions/what-s-climate-change-and-how-s-it-important)), and increase in demand are all drivers behind projected increased scarcity.
    From

    Answer:

    The assertion should read the scarcity of drinkable fresh water is serious world wide problem.

    Explanation:

    The Oceans cover vast areas of the globe but the salt water in these oceans is not useable for either drinking or irrigation. There are many fresh water lakes, notably the Great Lakes of America and Canada, the water in these lakes must be filtered and cleaned before the water can be used for human consumption.

    Many rivers are used not only for drinking and irrigation but also for the disposal of waste products. The human waste is dumped into the rivers making the water downstream unusable until it has been treated.

    There is a limit amount of usable fresh water. Much of the water has
    been polluted and will become more polluted. At the same time the human population of the world is increasing, increasing the need for fresh water. The scarcity of fresh water will only increase in intensity as the demand for fresh water increases.

    To

    Answer:

    Most of this water is salt water and usable freshwater is much more rare. Increased demands and climate change are predicted to increase scarcity.

    Explanation:

    The Oceans cover vast areas of the globe but the salt water in these oceans is not useable for either drinking or irrigation. There are many fresh water lakes, notably the Great Lakes of America and Canada, the water in these lakes must be filtered and cleaned before the water can be used for human consumption.

    Many rivers are used not only for drinking and irrigation but also for the disposal of waste products. The human waste is dumped into the rivers making the water downstream unusable until it has been treated.

    There is a limit amount of usable fresh water. Much of the water has
    been polluted and will become more polluted. At the same time the human population of the world is increasing, increasing the need for fresh water. The scarcity of fresh water will only increase in intensity as the demand for fresh water increases.

    The image below shows water stress by country:
    http://www.wri.org/blog/2013/12/world’s-36-most-water-stressed-countries

    Prediction of future water scarcity:
    http://www.wri.org/blog/2015/08/ranking-world’s-most-water-stressed-countries-2040
    Changes in temperature , precipitation patterns (both due to climate change), and increase in demand are all drivers behind projected increased scarcity.

  • David Drayer
    @david-drayer David Drayer wrote an answer.
    1 month ago

    Answer:

    The assertion should read the scarcity of drinkable fresh water is serious world wide problem.

    Explanation:

    The Oceans cover vast areas of the globe but the salt water in these oceans is not useable for either drinking or irrigation. There are many fresh water lakes, notably the Great Lakes of America and Canada, the water in these lakes must be filtered and cleaned before the water can be used for human consumption.

    Many rivers are used not only for drinking and irrigation but also for the disposal of waste products. The human waste is dumped into the rivers making the water downstream unusable until it has been treated.

    There is a limit amount of usable fresh water. Much of the water has
    been polluted and will become more polluted. At the same time the human population of the world is increasing, increasing the need for fresh water. The scarcity of fresh water will only increase in intensity as the demand for fresh water increases.