Our major source of energy is from nature. Every year, we use many kinds of energy such as solar energy, hydroelectric, windpower,... that are all produced in natural resources. With the high demad of mankinds, every year, a huge amount of fossil fuels have been collected to produced electricity for people in daily life. Besides, human also use renewable energy such as solar energy, windpower to reduce the number of natural resources that have been run out of. In short, we are living by energy of nature, so we need to use properly to both save nature and save our life.