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While fresh water is a renewable resource, in some areas, overpopula on and
increased demand on the water supply, lack of water conserva on prac ces, and
pollu on of the water source can cause water to become scarce. This is especially a
big problem in ci es situated in dry areas. A decrease in water availability can affect
agriculture, farmland, livestock, and other living organisms (including humans) in the
area.

Using Renewable Resources
Because the world will not be able to depend on oil, gas, and coal forever, we must
find other ways to power the kind of life style that we are accustomed to.

Solar Power
Solar energy is energy from the sun. Solar
power is the conversion of sunlight into
electricity, either directly using photovoltaic
(PV), or indirectly using concentrated solar
power (CSP). Concentrated solar power
systems use lenses or mirrors and tracking
systems to focus a large area of sunlight into a
small beam. We know that global wind and
ocean currents are powered by solar energy.
Unfortunately, solar cells work less efficiently on cloudy days and not at all during the

night. Ba eries can be used to store
solar energy, but they cannot hold very
much and disposing properly of old
ba eries can be an issue.

Wind Power
Wind has been used for thousands of
years as a source of energy on sailing
ships and windmills to pump water.
Today, windmills can be used to generate
electricity, usually located on a wind
farm.

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