Quote Originally Posted by mathewhayden
Based on a study commissioned by the United Nations, global warming is projected to increase the average tempature by 3.5 degrees over the next century. According to the IPCC (Inter-govermental Panel on Climate Change) the likely result would be that sea levels would rise by between 0.09 and 0.88 meters. While lots of the experts disagree on the details, even if the entire Greenland Ice Sheet melted and West Antartic Ice Sheet fell into the sea, its projected that the sea level would rise roughly 10 meters. While this would definitely cause big problems, especially in low lying coastal areas, it doesn't appear possible that it would "flood the rest of the world". Check out the Earth Observatory website by NASA for more details.
Well, first of all, the data I found suggests over the last 100 years, the oceans have risen by 20 cm (8"). I would suspect we can see another 20 cm if the trend continues. However, I think it will flatten out. We are probably in the start of another solar minama. No way to know yet, but it could be as severe as that of the 1600's.

80% or more of the last 100 years sea level rise is easily explained by the increase in average ocean temperature. When you consider the oceans cover 361 million square kilometers of surface area with a volume of 1.3 billion square kilometers, that makes an average of depth for the purposes of calculation of 3.6 kilometers, or 360,000 cm. 20 cm is only 0.0056% of that depth. It doesn't take much of an average temperature increase to expand water by 0.0056%. It probably takes an average increase in sea temperature of 0.4 C to rise the level by 20 cm.

Now of course, average temperature varies and it isn't linear. The change varies with salinity also. However, my point is that it takes little change in sea temperature.

Play with the densities yourself:

Water Density Calculator