Mar 30

　　Tony Blair describes climate change as “probably the greatest long-term challenge facing the human race.” He has harangued MPs and foreign leaders alike on the importance of cutting greenhouse-gas emissions. To prove his dedication, the prime minister promised in 1997 that Britain would reduce emissions from their 1990 levels by 12.5%. By 2010, he said, Britain would have cut carbon-dioxide emissions by 20%. But progress towards this goal has been slow and recently it has reversed: carbon-dioxide emissions have risen each year since 2002.