The
controversy of harnessing solar energy
We often hear about solar cars, solar
heating and solar batteries. But will solar energy ever be the major source of
energy for society ?
Solar energy is cheaper than other
fossil fuels because we can get an abundant source from the sun.
In sunny desert areas, 50% of the
sun’s radiation that reaches the ground could be used to produce electricity
for business and industry, to provide heat, light, and hot water for homes.
Experimental solar ponds can also produce hot water to drive generators.
Unfortunately, we can’t yet power
our homes entirely on sunlight.
Solar energy can only be used
effectively in bright light. Its greatest potential therefore is in hot
countries that have clear skies for most of the year. But, unfortunately most
houses are not always in the sunniest part of the world. Moreover, in order to
harness solar power , solar cells are needed to convert sunlight directly into
electricity. Solar cells are very cheap to run, but relatively expensive to buy
and many people can’t afford them.
Needless to say, solar energy is
useful and non pollution source of energy. However, solar cells the main device
to harness the sun’s energy are still very expensive.
Discussion Text
·
Purpose
: to present information and opinions about more than one side
of
an issue ( for pins and against points )
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Text
organization :
§
Opening
statement presenting the issue
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Argumentts
for different points of view ( pros and cons )
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Conclusion
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Language
Features :
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The
use of general nouns
Example : alcohol, abortion, smoking,
drugs etc
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The
use of thinking verbs
Example : think, feel, hope, believe
etc
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The use of additive connective
Example : in addition, furthermore, besides
etc
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The
use o contrastive connectives
Example : although, nevertheless even
if etc.
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