How much CO2 is release from the polar ice?

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Not enough to worry about.
CO2 is not a by-product of evaporation nor sublimation, so I would say that the amount "released" by polar ice is negligible.
Are you asking about the little bubbles of ancient atmosphere frozen into the ice? That carbon dioxide is not the problem, of course. The problem has to do with returning vast amounts of ancient carbon to the air that has been locked away in coal, petroleum, and natural gas. Add in deforestation, and we have a problem.
a negligible amount. be more concerned about permafrost tundras melting and releasing methane.

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