SOLAR ENERGY
In one year the world uses as much energy as that
contained in 21 billion barrels of oil,and each year the
need for energy grows.this means that the fuels needed
to produce energy should also grow;but the supply of
fuels for example,coal,oil,and gas is limited.In fact,these
fossil fuels may not last for a century.What,then,will
take their place?For the answer,man should look to
sky.Each day the earth receives much more energy
from the sun than it can use.And this energy is free.
The only problem is that we don't know how to
control it.If scientist can learn how to use the power
of the sun,its energy could be put to many different
uses.For example,mirrors could concentrate the sun's
energy in such a way that it would melt metals.Solar
heaters could be used to warm our houses and cook
our meals.And solar batteries could be used in telephone
communication,in space exploration and research,
and in farming.Perhaps the greatest problem in
controlling the sun's energy is making it continuous;
that is,in discovering how solar energy can be stored
so that it will be available when the sun doesn't shine.
