Solar Energy for Life

Earth receives 174 petawatts (10 15 watts) of solar radiation in the atmosphere. About half milardesimo energy that the sun shines all the time. Not all the radiation that came to the ground, however, partly thanks to an atmosphere that reflects and absorbs some of it. Cycle of solar radiation 

About 35% of incoming solar radiation reflected back into space, he talked in this case reflect the radiation. 14% of solar radiation is absorbed in the atmosphere, it is called in cases of radiation absorbed. 

The existence of the atmosphere not only reduces the amount of solar radiation at Earth's surface, but also the quality, and promote 20% of light in different directions and change the spectrum of electromagnetic radiation. A simple chart to help you understand the flow of solar energy. As in any open system, the Earth receives and gives energy. 

The energy absorbed by the Earth (51%) or from the atmosphere (14%) then ripropagata into outer space, in the form of re-emitting radiation. In the long term energy balance of the earth is always balanced. During the journey of solar energy lead to the process of photosynthesis and the same life on this planet. 

A compound called chlorophyll allows green plants to absorb light energy to produce materials of life and must start the food chain. When they die, plants and animals are eaten by other organisms, all mixed into the soil to facilitate the establishment of new plants.