If polar ice caps melt, the length of the day

In the process of melting of ice, external torque acting on earth is zero. Therefore, angular momentum (L) of earth about the axis of spin is conserved.L = I ω = Constant⇒ I . 2π / T = L ⇒ T = (2π / L) . IDue to melting of ice and action of centrifugal force, more mass is accumulated near the equator. So ' I ' increases and hence T also increases.