An alternative energy, or more precisely an alternative energy source is one that may replace the current energy sources or energy, whether their lower polluting effect, or primarily for its possibility of renewal. Energy consumption is one of the major gauges of progress and welfare of society. The concept of "energy crisis" appears when energy sources from which the company supplies are exhausted. An economic model as the current operation of which depends on continuous growth requires an equally growing demand for energy. As sources of fossil and nuclear energy are finite, it is inevitable that at any given time demand can be supplied and the whole system to collapse, unless they discover and develop new methods for energy: these would be alternative energy. Together with this is that the abuse of conventional energy present today such as oil from coal combustion among other issues carry with them as progressive worsening pollution, increased greenhouse gases and perforation of the layer ozone.
Scientists are currently looking for solutions to solve this impending crisis. So they find some alternative sources that they can use. There are wind energy, hydropower, tidal energy, wave energy, solar energy, geothermal energy and biomass energy.
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