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Achieving such predictability to enable a greater reliance on a single "clean" energy source is the hardest aspect. So, that's why I would only believe net-zero to be achievable with a wide array of options. Just like we don't see all motor vehicles running on a single fuel, it's impossible to neglect some energy resources such as biomass-based motor fuels which may still be pointed out as "dirt" by the ecoterrorists.
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