Reuters: If any country can claim to be pitched on the global warming front line, it may be the North Atlantic island nation of Iceland. On a purely physical level, this land of icecaps and volcanoes and home to 300,000 people is undergoing a rapid transformation as its glaciers melt and weather patterns change dramatically. But global warming is also having a profound effect on Iceland economically — and in many ways the effects have actually been beneficial. Warmer weather has …