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If the poles ice would melt, would it be critical for human survival to try to bring it back?

If humanity will cause natural dissolution of all ice in planet earth's poles and the sea level would indeed rise tremendously all over the world --- would it be justified to try to "reverse" the situation of the poles? Would this be critical, or rather in general, would humans be able to thrive on earth and to even do climate engineering just without icing back the poles?