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It's probably impossible to accurately simulate the climate of the planet decades into the future.

That does not meaningfully detract from the evidence for human caused global warming however.

I have to applaud the subtle elegance of the sarcasm here

No sarcasm intended. The science of climate change rests on many legs. It was already established long before massive models on the scale we have today were possible. Computer simulations attempts to understand how it will affect us, but does not contribute much evidence.

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