I just read over at The Corner that sea levels may have decreased in 2010. So I followed the link to Watts Up With That, written by a warming skeptic named Anthony Watts.  From the post:

Of course the rate is not constant.  The rate of rise over the past 5 years has been half the overall rate.  At the rate of the past 5 years it will be the year 2774 before the oceans rise a single meter.  Of course a decrease in the rate is technically an negative acceleration in the rate of rise, so technically the rate of rise is accelerating, but in a negative direction.  That statement is misleading though as most people consider acceleration to be a positive effect.

Even more interesting is the fact that from 1992-2005 there was an increase each year.  2006 was the first year to show a drop in the global sea level.  2010 will be the 2nd year to show a decrease in sea level.  That is correct, 2 of the past 5 years are going to show a decrease in sea level.  2010 could likely show a significant drop global sea level.  By significant I mean it is possible that it will likely drop between 2-3 mm from 2009.  Since the data has not been updated since August it is difficult to guess more precisely, but the data ends at the time of year that the seasonal drop begins to show up.  If the drop does show up as expected it is possible that 2010 will show the largest drop in sea level ever recorded.

Well, it was clearly global warming.  Obviously.  And if they rise again, that will be too.

More importantly, this may be yet another big mistake in IPCC predictions:
One fact is certain.  A drop in sea level for 2 of the past 5 years is a strong indicator that a changing sea level is not a great concern.  In order for the IPCC prediction to be correct of a 1m increase in sea level by 2100, the rate must be almost 11 mm/yr every year for the next 89 years.  Since the rate is dropping, it makes the prediction increasingly unlikely.  Not even once in the past 20 years has that rate ever been achieved.  The average rate of 2.7 mm/yr is only 25% of the rate needed for the IPCC prediction to be correct.

I don’t know if Watts is correct, but it looks like Manhattan is safe for awhile.

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