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Because is essentially an endless supply of energy, with only a small percent of the actually total that even reaches the earth. Cosmically speaking the sun will be around for a few more billion years, more than enough time for man to have either moved on or messed the planet up beyond redemption. :)

Newer and cheaper technologies are being developed all the time which increase the amount of "raw" sunlight that is converted into electrical energy.

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Long enough in fact for Man to have died out as a species - individual mammal species appear to last about 3M years on average. So yes, we're OK, the Sun will still be in its present, stable stage. More seriously, whilst the engineering (I don't use that lazy word "technology") is improving all the time as you say, the difficulty will be the eventual expiry of the world's reserves of raw materials and fuels necessary for their manufacture, transport etc.

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