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Most renewable energy is direct or indirect solar energy (aka The Big Fusion Reactor In The Sky), so no fuel there. Even biofuels (done right) are using carbon recently pulled from the atmosphere, and so they won't change the level of carbon dioxide in the long term. So no fuel consumed generating the energy, and if you build each generation of gathering system using renewable energy, the carbon consumption approaches zero.
The possible downsides of some aspects of renewable energy is miniscule compared to all finite energy. There is no contest - renewables are the only ones that last as long as the Earth does, and that do not mess up the environment we depend on to live.
Will there be any oil or coal or gas or uranium left in 10,000 years? Who are we to use it up as fast as we want to?
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