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a datacenter at the poles might also contribute to melting the ice.

More or less than burning fossil fuels to keep the data center cool at non-polar latitudes?

Less than or equal to the same amount of energy would be dissipated, but it would be closer to the actual ice.

But global warming isnt caused by energy dissipation, its caused by the greenhouse effect.

I'm not sure why you're getting downvoted. Humans producing heat is not the problem; humans producing pollution is.

it would contribute less co2 into the atmosphere, at the cost of physically and directly melting the ice. All-in-all it seems like a poor trade-off.