Renewable Sources Of Energy

Countries of the world rely heavily on petroleum, coal and nature gas for their energy sources. There arr two major types of energy sources: renewable and non-renewable. Hydro-carbon or fossil fuels are non-renewable sources of energy. Reliance on them poses real big problems. First, fossil fuels such as oil. Coal, gas etc, are finite energy resources and rhe world eventually wil run out of them. Secondly, they become too expensive in the coming decades and too damaging for the environment causing global warming. In contrast, renwable energy sources such as, wind and solar energy are constantly and natirally replenished and never run out. Most renewable energy comes either directly or indirectly from the sum. Sunlight or solar energy can be sued for heating lighting homes, for generating electricity and for other commerical and industrial uses. The sun's heat drives the wind and this wind energy can be captured with wind turbing to produce electricity. Then the wind and the sun's heat cause water to evaporate. When this water vapour turns into rain or snow and flows downhil into rivers or strenams, its energy can be captured as hydroelectric energy. Along with the rain and snow, sunlight cause plants to grow. Plants produce biomass which again can be turned into fuels such as fire wood, alcohol, etc identified as bioenergy. Scientists have identified Hydroelectric energy as another from of renewable sources. It is the most aboundant element in nature. But is does not exist separately as a gas. It is always combined withe other another element, can be burned as a fuel to produce electricity. Our Earth's interior contains molten lava with tremendous heat. This heat inside the Earth produce steam and hot water which can be tapped as geothermal energy to produce electricity, for heating homes, etc. Ocean energy comes from several sources. Ocean's force of tide and wave can be used to produce energy. The surface of the ocean gets more heat from the sun than the ocean depths. This temperature difference can be used as energy source too. (Source: the Internet)