Our future energy can rely on controllable fusion commonly known as man-made sun, fusion is two lighter nucleus polymerization as a heavier nuclei, and releases energy process. Earth's energy, whether to fossil fuels, wind, water or animals and plants form stored, final source is the sun: fossil fuels by millions of years ago is evolved from the animals and plants, animals and plants (either today or previous) energy is final, want from at the bottom of the food chain plant photosynthesis and the stored solar, The wind was the cause of the heating of the atmosphere, as the sun caused by uneven and; As the potential energy of hydraulic should rely on solar heating position of water in the match to evaporate, rise, again by precipitation form by "handling" to a higher position, thus forming a potential energy. Therefore, whether human beings use this on which one energy, in essence, is in the use of solar energy, and the sun's energy is derived from nuclear fusion, therefore, human if mastered the orderly release nuclear fusion energy method is mastered the sun's energy sources, equals mastered endless fossil fuels, wind and hydraulic energy, some people advocating modern industrial will because no energy source and ruin views have went bankrupt. Use of nuclear energy ultimate objective is to achieve controlled fusion. Fission when rely on the nucleus to split and release energy. Fusion is by lighter nucleus polymerization into heavier and heavier nuclei release energy. The most common is composed of hydrogen isotopes of deuterium (read "dao", also called deuterium) and majority (read "chuan", also called super deuterium) polymerization into heavier nuclei like helium and release energy. There are two major nuclear fusion than nuclear fission advantages. One is the earth reserves of fusion can than nuclear fission can enrich much. According to calculate, each litre contains 0.03 grams of deuterium, so only in seawater on earth have 45 WanYiDun deuterium. 1 litre contain deuterium, after fusion can provide equivalent 300 litres of petrol after combustion released energy. Earth nuclear fusion can contain approximately contain can undertake nuclear fission elements can release all nuclear fission can 1,000 million times, can saying is inexhaustible energy. As for majority, although do not exist in nature, but by neutron with lithium role can produce, and seawater also contains a large number of lithium. The second advantage is clean and safe. Because it doesn't pollute environment of radioactivity, so is clean. At the same time can be controlled fusion reaction in the thin air continuously stability, so it is safe.