The greatest expert on sea levels is Dr. Nils Morner, who did a report for the IPCC which they ignored, as it did not suit their alarmist agenda.

The following is an extract from a recent article.

“…the uncompromising verdict of Dr Mörner, who for 35 years has been using every known scientific method to study sea levels all over the globe, is that all this talk about the sea rising is nothing but a colossal scare story.
Despite fluctuations down as well as up, "the sea is not rising," he says. "It hasn't risen in 50 years." If there is any rise this century it will "not be more than 10cm (four inches), with an uncertainty of plus or minus 10cm".
http://www.telegraph.co.uk/comment/columnists/christopherbooker/5067351/Rise-of-sea-levels-is-the-greatest-lie-ever-told.html

You need to learn to distinguish, justoneperson, between alarmist nonsense, as you receive from websites like realclimate, and from the IPCC, and real science.

There is no science to back any assertion that human emissions contribute to global warming, just an alarmist unscientific guess from the IPCC that it is “very likely”.

"Greatest expert on sea level", in his own mind, see http://www.climatechangefacts.info/ClimateChangeDocuments/NilsAxelMornerinterview.pdf its not far down the first page
Apart from himself and you denier/doubters/skeptics he's not highly thought of, see http://www.guardian.co.uk/environment/2010/mar/15/ipcc-sea-level
a "quote from a letter from the International Union for Quaternary Research (INQUA), in which they disown Morner and his remarks.
Apparently he ignores satellite altimeter records, he and from what i read he alone thinks they're incorrectly calibrated. Apparently this is one of the reasons the IPCC think so 'highly' of him.
You quote from a Christopher booker article, sorry tooo easy for an ad hom, christopher booker, a journalist who thinks passive smoking, asbestos, and BSE aren't dangerous and believes in 'intelligent design'....jeez leo you should have checked him before using him, how embarrasing for you!