Beijing's ancient Drum and Bell Towers a

Beijing's ancient Drum and Bell Towers are lost in the haze as a man takes in the view looking north from the pavillion atop Coal Hill in Jingshan Park, north of the Forbidden City, on a smoggy day in Beijing on December 10, 2009. Despite China's pledges to improve energy efficiency, its carbon emissions could double by 2020 as compared with 2005 levels, surpassing limits seen as key to fighting global warming, experts say. The world's largest carbon gas polluter, China has promised to make gains in energy efficiency but as a developing nation insists that developed nations should bear most of the cost of tackling climate change. AFP PHOTO/Frederic J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP via Getty Images)