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Water is a source of energy, but it is not free and we are using up this resource at a rate that may find us in trouble soon. There has been an international committee for many years whose sole purpose is to try to find how to conserve water because our planet's life depends upon it.
Renewable energy (sources) or RES get their energy from natural flows of energy (on-going natural processes), such as flowing water (hydroelectric), sunshine, wind, biological processes and geothermal heat flows.