How to Gather hydroelectric power from the Sun.

It took nearly 500 million years for the formation of the present coal and oil deposits. but the extravagant humans of the twentieth century have deplated them so fast that the entire coal reserves would barely last for another 100 years. wood can be grown by reforestation, but the process is very slow and inefficient. Actually, the area under the forests is already diminishing due to the growth of urban areas, industrialisation, road building, etc. So one has to look for alternate sources of energy.
Hydroelectric power from the river dams is indirectly derived from the Sun. It is the heat of the Sun that vaporises the water of the oceans that ultimately cause rain to fall and fill the reservoirs. Water stored in dams is then used both for irrigation and producing electric power. However, hydroelectric power can augment power supply only to small extent, and building of dams has been linked to environmental problems. Even in developed countries hydroelectric power accounts for only two per cent of total power supply.
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