altrnative energy

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what do you think is the best substitute for non renewable energy? the lifestyle we were used to is now coming to an end, energy is becoming expencive, and will not last forever. luckily we came up with a certain number of alternative, from solar energy, to eolic, to bio-masses, etc ... do you use any of these alternatives? what are their ups and downs? what would you say is the best source of clean energy?