Today the main source from which we derive energy is fossil oil. This is a non-renewable source and it will run out in the near future. We need to find alternative energy sources to power our world, and we have to begin now and not wait for the inevitable to happen.
Some possible alternative sources of are: solar energy, wind power, geothermal energy, tidal energy, hydroelectric power, biofuels and nuclear energy.
Solar energy is energy harnessed from the sun. Today it is commonly used for heating. It is also converted into electrical energy that is used for electrical devices. Wind power uses wind to drive generators for producing electricity. Geothermal energy is derived from heat produced by volcanic activity. This is usually used for heating and generation of electricity. Tidal power is also used for the generation of electricity.
Hydroelectric power plants are commonly used in may countries to generate electricity. This requires the building of large dams that can have a high impact on the eco-system.
Biofuels include biodiesel made from vegetable oils. This is a cleaner alternative and there is a lot of increase in its use.
Nuclear power is used for the generation of electricity but its use is on a downward trend because of its potentially harmful nuclear waste and by-products.
In order to preserve our environment, clean renewable energy sources are preferred. Some of the alternative energy sources mentioned do fulfill this requirement. However more research and development are needed in order to make them viable energy sources for our future needs.
run out to finish
harness to control something, usually in order to use its power