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In the years 70-80 (1970-1980) to foreshadow a serious energy crisis with the rapid depletion of known reserves of oil and gas. The consequences would be catastrophic for mankind, but fortunately came just in time energy produced by nuclear fission. Nuclear power we have saved, so they were a necessary evil. Another 2-3 cycles (a cycle is about 30-40 years) they could be useful (even if they will evolve and will use the energy produced by fusion, in which case their effectiveness will increase considerably). However we must prepare in advance the future energy.
The most elegant solution which can be now seen is solar energy. This is practically inexhaustible, in quantities much greater than the planet needs, it is the clean, handy and can become the most affordable (if panels with photovoltaic cells will be produced in industrial quantities increasing). Because the method for obtaining solar energy to be totally clean, it is absolutely imperative that converted solar energy into electricity to be distributed directly to national energy networks (with Ads) to avoid such use different batteries (polluting). Although it is small, efficiency of energy conversion in cells, has increased and will increase further due to scientific research in the field. (May be made to specify that all living matter on Earth is the energy of the sun, either directly or indirectly).
The discovery of real particles faster than the speed of light (probably smaller than those known today) will open new chapters in the development of mankind, since even with energy. Going deeper into the matter, and passing the quantum level, at subquantum level or maybe even deeper, we can issue (and control) increasing energy. Matter is structured in such a way as to permeate more inside them, the particles of which is composed are increasingly smaller and lighter, more stimulate more dynamic and energetic. Although particle mass decreases, the speed is much greater, so characteristic particle energy (energy increases with the mass and the power of two of particle velocity) is much higher. Links to quantum levels (within the atom) are more powerful than the chemical-molecular (in the molecule or between atoms), but lower than those at subquantum levels (in the atomic nucleus, between nucleons), which in turn are overshadowed by the level immediately below, the sub-subquantum level (in nucleon, between the particles that compose it), and so on until we reach the basic level at which the particle can no longer be divided into other components. How about energy and greater energy released or required to break or composition of these links is higher.
Hydrogen as a key component, can be obtained in multiple ways, from almost any item, by nuclear reactions, by the decomposition of water under the action of radiation, by electrolysis of water, etc. The hydrogen by burning It is not a real source of energy (as on Earth not much is found in isolated forms that can be extracted directly and then used as fuel, it is generally achieved with energy consumption greater than the energy released by burning etc.), but more strategic like a fuel which can be life-long internal combustion engines when the fuel oil will lessen or even exhaust.
Wind energy don’t represent a real alternative energy, but in some cases it may be a component to complete certain energy goals.
The energy produced from thermal springs in some areas of the planet is very useful, but are very little compared to the planet needs.
Probably wave energy seas and oceans has not given good results since it was not extended and imposed, the more so as we have a planet covered with water at the rate of 70%.
Maybe in the future to exploit the temperature difference between the different levels of seas and oceans to produce such energy.
For now the water remains a serious source of energy in chapter hydropower. From water as well one extracts the hydrogen, which through burning turns back into water. From water to obtain "heavy water" (by converting of hydrogen in hard isotopes Deuterium, which contains in nucleus in addition to a proton and a neutron), which is used as nuclear fuel in some nuclear power.
If you look at global and retrospective, water and sun energy sources means the bulk of our planet. Even living matter (including man) is a very high water. Water is the underlying cellular level, intervening directly or indirectly in several ways.
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Energy, Nuclear Power, Photovoltaic Cells, Hydrogen, Wind, Thermal, Wave, Hydropower.,