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Message: <blockquote data-quote="Hypersmurf" data-source="post: 3360657" data-attributes="member: 1656">As I understand it, it's not the melting of floating ice that's supposed to increase sea levels; it's a/ the melting of ice that's on land, meaning that water that wasn't in the ocean in any form ends up in the ocean, and b/ the heating of water that's already in liquid form.  Water is densest at about 4 degrees C, right?  So if something causes a whole lot of 4 degree water to become 5 degree water, it will take up more space.If someone says "If the Arctic pack ice melts, seas will rise and we'll all drown!", their physics is out.But if they say "If the Arctic pack ice melts, it won't be long before the Antarctic and Greenland ice sheets melt too, and then seas will rise and we'll all drown!", they're at least basing their fears on something that makes some sense.-Hyp.</blockquote>