Always developed countries have used large amounts of energy to feed its technological and industrial growth, but in recent years in developing countries have become major consumers of energy for its development. Electrical power is usually generated at a power plant that converts other kinds of energy into electricity. Each system has advantages and disadvantages, but many of them are worrying environmental problems. The main feature of nuclear energy is the high quality of energy that can be produced per unit mass of material used in comparison with any other type of energy known by human beings, but surprised the poor efficiency of the process, since it wastes from an 86 to 92% of the energy that is released. Under normal operation, a nuclear power plant releases very little pollution of any kind on the environment. But it produces several types of nuclear waste. It produces a few volumes moderate low level waste; which can be removed by placing them simply somewhere that is not accessible for a few years. However, a relatively small amount, perhaps a ton is generated per year in the case of a great nuclear power, high-level waste, which poses a problem to get rid of it.
You can be expected to be dangerous for decades, centuries, even millennia, so it must be methods of disposing of it which are extremely safe. Typically, the majority of these residues are stored in media storms that require a constant and careful attention. Accidents at nuclear power plants pose a serious risk of environmental contamination. Such as the Chernobyl accident, and lately in Japanese nuclear power plants due to the earthquake and subsequent tsunami it released large amounts of radioactive contamination. Advantages nuclear energy, for example in the European union generates a third of the electrical energy that is produced in this area, thus avoiding the issuance of 700 million tons of carbon dioxide per year into the atmosphere.