Orlando Sentinel: The U.S. has done the least among the world’s eight most industrialized nations to address global warming, according to a new study. The G-8 Climate Scorecards 2008, released ahead of next week’s gathering of the Group of Eight in Japan, also found that none of the eight countries is making improvements large enough to prevent temperature increases that scientists think would cause catastrophic climate changes. The gathering will include the heads of states of the U.S., Japan, …