The alternative sources of energy
Nowadays,when a great progress of civilization is taking place, energy is the key to sustainable development.It has always been indispensable to most human activities such as domestic life, agriculture, industry and transport.Now it is a precious good but today's energy system is dominated by the powerful and centralized supply of fossil fuels.80% of them are consumed in industrialized countries and they account for 80% of carbon emissions-the main cause of the greenhouse effect.World population is expected to double by 2050 and the result will be that energy consumption will tripl
The renewable energies will surely be needed when a big increase in the demand of energy takes place. They create no pollution and can be opetated almost anywhereand require little maintenance. Burning of wood and straw gives biomass energy which is already used largely for cooking and heating in developing countries. provide industrial growth and improve standard of living. Solar-thermal technologies that use mirrors or lenses to concentrate the sun's rays on the heatexchanger,are being incorporated in power plant projects in many countries in the worldElectricity is also produced by photovoltaic devices. The new sources of energy are sun, wind. One can imagine the level of environmental pollution resulting from several decades of demographic growth. This technology works economically and is not connected to national power plants. But this way of gaining energy brings a lot of problems. water, modern biomass(wood harvested in such waysas to avoid alterinf the forests). First,the consumption of energyshould be saved and secondly,more flexible fuels(renewable energies)should be used. Biomass is another major alternative energy source. They can help developing countries become more energy self-reliant.
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power plants,
renewable energies,
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