Steve,

Tell that to Friends of the Earth, the Chief Scientist at Environmental Defense (who, after 8 paragraphs outlining the terrible threat at least concedes it is “pretty remote”), Laurie David’s stopglobalwarming.org, and, of course, Al Gore, who in An Inconvenient Truth says, “Some scientists are now seriously worried about the possibility of this phenomenon recurring” (see here, p.67, for excerpt.)