Prices for these fuels are already getting higher and carbon emissions from such fuels are damaging clean environment of the earth. Considering all these factors it is urgent to consider and adopt renewable energy sources.
In contrary to fossil fuels, renewable energies are reversible in nature and can constantly replenished without the fear of been drained out of our environment. Wind energy for instance is one of the forms of renewable energy; energy is produced with the help of wind blowing across. It is obvious that wind is always going to blow across and will not run out until the last day of earth. It will keep on providing electricity without any thought of wind to blow off from our planet. Such energies which can go on to keep producing electricity without reducing source energy it self is renewable energy.
Sun is the major source of renewable energies either responsible for direct or indirect source of energies. Sun light and solar power is direct form of energy which is received from Sun on massive scale. Solar power technology provides electricity for homes, office buildings, water heating or cooling and for various other applications. Sunlight and itsí heat is indirectly responsible for winds to blow across our earth. These winds are then blown through wind turbines to produce electricity; this technique for producing electricity is known as Wind power.
Sunís heat and winds makes water to evaporate which then through natural process falls back on earth in form of rain water and snow into oceans dams, rivers etc. We can produce energy with this procedure by using hydroelectric power. Just as the process of rain goes on it makes plants to grow, this organic matter which brought up plants is called biomass. Biomass technology can be used to producing different useful chemicals, fuels, and electricity. Using biomass technology to produce any of such products mentioned above makes it called Bioenergy.
Numerous organic compounds present till day and water carries Hydrogen element. It is known to be the richest element on the face of the earth; however hydrogen element cannot be found alone in form of gas in our environment. It is always combined with some other elements to form some other element. Most common example known to most of us is hydrogen is combined with oxygen to form water. When we separate hydrogen element from other element it can be used as fuel to produce electricity.
There are other forms of renewable energies which are not majorly caused by Sun. For instance Geothermal energy, when heat from with in the earth is used for producing energy is called Geothermal energy and on the other hand gravitational pull of earth and moon brought up tidal power in oceans and rivers which can be used to produce electricity, known to be tidal power.
Note: here is very intereting article mentioning top Top six renewable energy sources. Click here for more details
We have mentioned 4 major source of energy which are considered renewable energy sources.