Barring the known ones, can we discover new sources of energy within the earth?

At the present our energy need is met with sources like coal, oil and gas, nuclear minerals and hydel power, and the ones like solar, wind, tides etc., are still to be harnessed with commercial viability. Thus, still our chief energy source is fossil fuels which are all set to exhaust at the most in 50-75 years with the current rate of their exploitation. Though nuclear energy is there as a future hope, it is beset with many environmental problems. Can scientists, more so earth scientists think of tapping the energy by different modes that could have been trapped within the earth. The earth’s birth and evolution has been possible through immeasurable amount of energy mainly through ‘fire works’ from both outside and within the earth. In what form is this energy bound? In what form the energy is still availbale for all the internal turbulence of the earth? Can we break it? if so how? Can this thinking be given a chance to germinate new ideas in the quest for new sources of energy from within our own ‘good earth’?

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