(1) The nation's energy use is largely dependent on fossil fuels. (2) These fuels are nonrenewable resources,
and they cause pollution. (3) We cannot continue our reliance on
a fuel that will eventually run out. (4) Thus,
we must find other ways to sustain our energy demands. (5) Pursuing
alternative fuel sources is the key to
solving our energy crisis.
(6) Through different technologies, such as solar cells, scientists have learned to use the sun's radiation to
create electricity. (7) Currently, about 1 percent of energy in the United States
is produced by the sun, and
solar energy has the potential to become a more widely used energy source
. (8) Solar energy is both
inexhaustible and clean. (9) The major limit to this alternative source is that equipment
is expensive.
(10)
Developing a cost-effective way to harness the power of the sun will be a significant
development in
solving
our energy crisis.
Which sentence references a counterclaim against the use of solar energy?
sentence 3
sentence 7
sentence 8
sentence 9