The energy demand of the world continues to increase also for the fast industrial and economic development of China and India, but oil coal and nuclear energy will not be able to satisfy it because too polluting and dangerous for our environment and because oil is going to run out within few decades or becoming too rare or expensive to extract.

The, the nuclear energy is particularly dangerous for its radioactive wastes that should be kept in safety for thousands years, before their decay, in sites extremely difficult to be found (people don't want a nuclear wastes site near their house) and for the great security and building costs of nuclear plants, very high already today that nuclear energy provides about 10% of the energy consumed in the world.

For these reasons, our economy and civilization will have a future only if it immediately starts to invest massively in the clean and renewable energy sources, like SOLAR, EOLIC, TIDAL, GEOTHERMAL and BIO-GAS that will be exploited altogether to satisfy all the energy needs of the world, especially if the energy demand of an increasing worldly population will keep on growing.

SOLAR ENERGY
Today, the solar panels transform sunlight in electric power, exploiting the potential difference among semi-conductor n and p-layers of silicon (Si), able to provide electric charges to an electric circuit.
The solar panels can be placed today on wide surfaces, like on the roofs of our houses, of hotels, public buildings, hospitals, schools and industrial plants.
Then, also deserts can be exploited, already today, to cover many Km2 with solar panels, given the intense and rather constant sunlight during the year, to provide great amounts of energy.
Their disadvantage is that the solar energy can't be concentrated and relatively wide areas must be covered with solar panels for a massive use of this energy source.

A good solution for this problem is the SOLAR ENERGY FOCUSING; the solar energy is focused by parabolic mirrors on a container or tubing containing a molten salt that can be heated at 200-300 C or more; this fluid can heat water to generate only hot water for houses heating or steam that can make work turbines and generate electric energy.
Alternatively, the molten salt fluid can be replaced by water, to produce steam for turbines.
These plants cover minor areas and are more powerful and various examples are already working in the world, like in Spain, Germany and California, for ex..

Solar energy

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