According to a report from a UK/Finnish group sea levels could rise by up to almost 5 ft (4 ft 11 ½ inches) by the end of the century.
But ‘up to’ clearly includes any figure below that, including no discernable difference at all.
Apparently the team has built a computer model that can reflect the relationship between temperatures and sea level over the past 2000 years.
For the model’s predictions outside normal parameters to work it has to be accurate outside the parameters. It is simply not possible to test it against reality without data and many a model that accurately reflects relatively chaotic behaviour within certain bounds fails singularly when taken outside them.
It is an fact that global temperatures were significantly higher than current levels, between the 9th and 14th centuries. A period of some 500 years when temperatures were warmer than those today, what does the model say about sea level and ice cover during that period?
There is also the fact that the data on temperature predictions fed into such a model has to be accurate for it to be accurate. GIGO as they say.
The fact is that the global temperature of 2007 was statistically the same as 2006 and 2005 and every year since 2001. Unless the IPCC does a Robert Mugabe on the figures ‘global warming’ appears to have, for the moment at least, halted .
What happens next is anybody's guess - and that’s really what it is, a guess.
It could warm up to something more like it was back in the middle ages, it could remain stable, conceivably it could drop. Whatever happens it will sooner or later change, one way or the other.
That’s what climate does - and has done since long before humans learned to harness fire.
Maybe politicians on the AGW bandwagon should think twice about bio fuels and punitive taxes before they cause a crisis of their own, a food crisis.
Mind that’s no reason not to cut pollution, or build nuclear power stations, or develop compressed air or hydrogen powered transport. That makes sense anyway.