"This is not good news for humanity. As the ice sheets melt due to global warming, not only do they raise the sea level directly; they also exert a weaker gravitational pull on the surrounding ocean. So water sloshes back toward the continents, where we all live. "If Antarctica shrinks and puts that water in the ocean, the ocean raises around the world, but then Antarctica is pulling the ocean towards it less strongly," explains the celebrated Penn State University glaciologist Richard Alley on the latest installment of the Inquiring Minds podcast. "And as that extra water around Antarctica spreads around the world, we will get a little more sea level rise in the US than the global average."