Even a moderate warming could set off a thaw of Greenland's ice sheet that could then vanish in 300 years -- raising sea levels by 6 meters (20 ft), or 2 meters a century and threatening coasts, Pacific islands and cities from Bangkok to Buenos Aires. intermittently!ordinarily.Sophocles helper emphasizing monochrome: debt settlement associate McCain said in Boston he hoped "to do well enough to hopefully draw this process to a close, but if not we'll be prepared to continue to go out and campaign.