The shrinking snowcap atop Mount Kilimanjaro has become an icon of global warming. Pictures of the African peak, which has lost 90 percent of its ice cover, were featured in Al Gore's documentary, "An Inconvenient Truth." Greenpeace activists once held a satellite news conference on the summit to sway participants in an international climate conference. But most scientists who study Kilimanjaro's glaciers have long been uneasy with the volcano's poster-child status.