renewable energy

Hi! My name is Ela, I am a Comenius assistant in Enrico Fermi school. With the students we work on the renewable energy e-twinning project. It is very important for us to protect our planet!!! This is a few information that we collect about the energy!
Renewable sources all come from the exploitation of the sun and can be divided into two categories according to the method of extraction. We have two methods. Direct methods include solar collectors, photovoltaic plants and concave mirrors, which concentrate sun rays to multipy the efficiency. Indirect methods are those exploiting nautral phenomena due to the sun, such as wind, sea waves, tides and falling water.
The sun is an inexhaustible source of energy that can be used for a wide range of applications. Passive solar energy, for instance, is captured when buildings are designed to use sunlight to heat rooms. Solar energy can also be used actively. Solar panels convert sunlight into electricity, using photovoltaic solarenergy (solar power). Solar heaters convert sunlight into heat in order to warm water and rooms. This is called thermal solar energy.
Wind energy - the fastest growing source of energy in the world - can contribute substantially to global goals for reducing CO2. Sites located offshore and in remote areas are ideal for wind farms: there is enough potential worldwide for wind farms to generate more than twice the forecast energy demand in 2020.Parallel to the rapid growth of large-scale wind energy production, alternative technologies are emerging, such as sophisticated small-scale urban turbines, which can be incorporated in the architecture of modern cityscapes.
Bio-energy is a cost-effective renewable energy source with considerable economic potential. Bio-energy can be produced with specially grown crops, but in the short term organic residues are the most cost-effective sources of biomass. Currently these come mainly from forestry, agriculture and the food industry. With biomass we can produce energy carriers such as electricity and heat, as well as liquid and gaseous fuels.
So as you see the energy is all around us, the most important thing is to transform it, to store it. If we want to save our Earth and feel safe in our planet we should to use the sources of possesing energy that gives us the nature. And what do you think about it?