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How Can We Save Our World looks at how the idea of sustainable development is having an increasing influence on a wide range of human activities. The books examine the environmental costs and unsustainable nature of modern life, and discuss ways in which society can progress toward a more sustainable future.
Sustainable Water Resources describes the origins of the world's water and how we use water in our homes, industries, and agriculture. It discusses:
€ The pressures on the water supply today
€ How water shortages affect people's lives
€ Technological solutions for providing clean water and processing water
€ How we can use water more efficiently to ensure there is enough for all.
LanguageEnglish
PublisherArcturus Publishing
Release dateSep 1, 2021
ISBN9781398817043
Author
Anne Rooney
Anne Rooney writes books on science, technology, engineering, and the history of science for children and adults. She has published around 200 books. Before writing books full time, she worked in the computer industry, and wrote and edited educational materials, often on aspects of science and computer technology.
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How Can We Save Our World? Sustainable Water Resources - Anne Rooney
INTRODUCTION
The World’s Water
Most people in the developed world never give a thought to water. It is there when we turn on the tap. We can buy bottled water at every supermarket and café. We wash in it, swim in it, and flush away our waste with it. Yet it is one of the most precious resources we have.
Two-fifths of the world’s population is short of water already, and the problem is going to get worse quickly. Within 25 years, between half and two-thirds of the people in the world will be suffering from a severe shortage of water. How did this happen—and what can we do about it?
Why we need water
People need fresh, clean water. We all need water to drink, to wash ourselves and our clothes, to cook with, and to wash food. Industry and farming use even more water. Our need for water is growing all the time, but the amount of water available for each person is shrinking.
Water shortages lead to misery, disease, and death. Half of the people who are ill in the world at any one time are suffering from diseases carried by unclean water. Crops will not grow without water, leading to famine and starvation. When people are desperately short of water, they take it from wherever they can. This may cause conflicts and wars.
FACE THE FACTS
Of the fresh water used in the world each year, only 8 percent goes to domestic use—drinking, cooking, and washing. A large slice—22 percent—is used by industry. About 70 percent is used by farmers watering crops and raising animals. The total amount of water we use is increasing all the time.
A finite resource
There is a fixed amount of water on earth. Scientists calculate that it is 0.3 billion cubic miles (1.4 billion cubic kilometers). It sounds a lot, but less than 3 percent of it is fresh water: the rest is sea water. Much of the fresh water is locked away in places where we cannot use it—in the polar ice caps or deep underground. Just 0.77 percent of the total water on earth is available for use by people. The water most easily accessible to humans falls as rain and snow each year, and it comes to only 8,157 cubic miles (34,000 cubic km). If we could force that water into a cube, each side would be just 20.2 miles (32.5 km) long.
A farmer in Mali collects water from a water hole to irrigate his onion crop in the dry season.
The water cycle
Water constantly cycles through different states. It falls as rain or snow onto land and sea. When it falls on land, it may soak into the ground, evaporate again, or run off into streams and rivers. Some water that sinks into the ground is taken up by trees
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