According to experts these sources will exhaust by the year 2050. Fossil fuels
also pollute the environment. So we need to search for alternative energy
sources which are reliable and renewable.
of energy, modern wind turbines are being installed in many countries to
After the oil crisis of the 1970s, many countries launched programs to develop
modern wind turbines. While many of these programs failed, Denmark was
successful in developing one. Countries such as the United States have adopted
helped increase the world’s wind energy generating capacity by nearly 150
efficient as other power generation technologies.
and the installation of large turbines and electric generating equipment.
Worldwide, hydroelectric power represented 19 percent of the total energy
generated in 1998, the most recent year for which data are available. In many
countries, hydroelectric power is the dominant source of electric power. Canada,
billion kilowatt-hours in 1999, about 60 percent of the nation’s electric power.
Hydroelectric-power generation in the United States increased from about 16
Solar power is the energy from the sun that is converted into thermal or
sometimes through prior focusing of the sun’s rays. The energy, once collected,
is used in a thermal process or a photo-electric, or photo-voltaic, process. In
thermal processes, solar energy is used to heat a gas or liquid, which is then
stored or distributed. In the photo-voltaic process, solar energy is converted
directly to electrical energy without intermediate mechanical devices. Solar
collectors are of two fundamental types: flat plate collectors and concentrating
collectors. A futuristic scheme that has been proposed to produce power on a
large scale envisions placing giant solar modules in geosynchronous earth orbit,
where energy generated from sunlight would be converted to microwaves and beamed
to antennas on earth for re-conversion to electric power.
Unless we contrive more efficient ways to develop alternative energy within this
year by year,
so do the pollution.