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All energy sources carry the same essential thermodynamic burden. The difference is that nuclear doesn't also emit green house gases.

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I highly doubt your first statement. Solar, for example, is no burden since if you do nothing it would land on earth anyway.

For fossil fuels you release chemically stored energy as heat. The same applies for nuclear power. Which is an additional thermodynamic burden...

That is true but human energy consumption is still insignificant compared to solar radiation - about a factor of 10,000 according to numbers I just looked up on Wikipedia - so even if we get everything from fossil sources that doesn't make a big dent in the energy balance.

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