The forecast: It seems there’s less chance of gloom and doom these days.
For sea level rise, now a maximum of about two feet by 2100. As for climate sensitivity, now for the first time ever, we are seeing mentions of a quadrupling of CO2 rather than a doubling to get scary scenarios. From Reuters:
Ice melt, sea level rise, to be less severe than feared – study
* Melt of Greenland, Antarctica less severe than expected
By Environment Correspondent Alister Doyle
OSLO, May 14 (Reuters) – A melt of ice on Greenland and Antarctica is likely to be less severe than expected this century, limiting sea level rise to a maximum of 69 cm (27 inches), an international study said on Tuesday.
Even so, such a rise could dramatically change coastal environments in the lifetimes of people born today with ever more severe storm surges and erosion, according to the ice2sea project by 24, mostly European, scientific institutions.
Some scientific studies have projected sea level rise of up to 2 metres by 2100, a figure that U.N. Secretary-General Ban Ki-moon has called a worst case that would swamp large tracts of land from Bangladesh to Florida.
Ice2sea, a four-year project to narrow down uncertainties of how melting ice will pour water into the oceans, found that sea levels would rise by between 16.5 and 69 cm under a scenario of moderate global warming this century.
“This is good news” for those who have feared sharper rises, David Vaughan, of the British Antarctic Survey who led the ice2sea project, told Reuters in a telephone interview.
Now onto climate sensitivity. Pierre Gosselin reports on his blog NoTricksZone this passage from yesterday’s NYT story on climate sensitivity.
Some experts think the level of the heat-trapping gas could triple or even quadruple before emissions are reined in. [...] Even if climate sensitivity turns out to be on the low end of the range, total emissions may wind up being so excessive as to drive the earth toward dangerous temperature increases.”
There you have it. Now climate scientists and the catastrophe-obsessed media are now forced, for perhaps the very first time, to talk about CO2 quadrupling in order to get the much wanted catastrophe scenarios.