A Chinese motorist wears a mask as she makes her way along a smog filled road in Hefei, east China's Anhui province on November 29, 2011. The amount of global warming gases sent into the atmosphere made an unprecedented jump in 2010, according to the US Department of Energy's latest world data on carbon dioxide emissions, with China alone was the biggest polluter with a spike of 212 million metric tons in 2010 over 2009.