Automakers from around the world show off their newest wares at the 2012 Beijing International Automotive Exhibition, hosted at the China International Exhibition Center in Beijing from April 23 to May 2, 2012. As luxury brands continue to whet China's appetite for high-end models, manufacturers are thinking green, putting focus on low-carbon vehicles. [Photo by Daniel Xu/China.org.cn]

Automakers from around the world show off their newest wares at the 2012 Beijing International Automotive Exhibition, hosted at the China International Exhibition Center in Beijing from April 23 to May 2, 2012. As luxury brands continue to whet China's appetite for high-end models, manufacturers are thinking green, putting focus on low-carbon vehicles. [Photo by Daniel Xu/China.org.cn]

Automakers from around the world show off their newest wares at the 2012 Beijing International Automotive Exhibition, hosted at the China International Exhibition Center in Beijing from April 23 to May 2, 2012. As luxury brands continue to whet China's appetite for high-end models, manufacturers are thinking green, putting focus on low-carbon vehicles. [Photo by Daniel Xu/China.org.cn]

Automakers from around the world show off their newest wares at the 2012 Beijing International Automotive Exhibition, hosted at the China International Exhibition Center in Beijing from April 23 to May 2, 2012. As luxury brands continue to whet China's appetite for high-end models, manufacturers are thinking green, putting focus on low-carbon vehicles. [Photo by Daniel Xu/China.org.cn]

Automakers from around the world show off their newest wares at the 2012 Beijing International Automotive Exhibition, hosted at the China International Exhibition Center in Beijing from April 23 to May 2, 2012. As luxury brands continue to whet China's appetite for high-end models, manufacturers are thinking green, putting focus on low-carbon vehicles. [Photo by Daniel Xu/China.org.cn]

Automakers from around the world show off their newest wares at the 2012 Beijing International Automotive Exhibition, hosted at the China International Exhibition Center in Beijing from April 23 to May 2, 2012. As luxury brands continue to whet China's appetite for high-end models, manufacturers are thinking green, putting focus on low-carbon vehicles. [Photo by Daniel Xu/China.org.cn]

Automakers from around the world show off their newest wares at the 2012 Beijing International Automotive Exhibition, hosted at the China International Exhibition Center in Beijing from April 23 to May 2, 2012. As luxury brands continue to whet China's appetite for high-end models, manufacturers are thinking green, putting focus on low-carbon vehicles. [Photo by Daniel Xu/China.org.cn]

Automakers from around the world show off their newest wares at the 2012 Beijing International Automotive Exhibition, hosted at the China International Exhibition Center in Beijing from April 23 to May 2, 2012. As luxury brands continue to whet China's appetite for high-end models, manufacturers are thinking green, putting focus on low-carbon vehicles. [Photo by Daniel Xu/China.org.cn]

Automakers from around the world show off their newest wares at the 2012 Beijing International Automotive Exhibition, hosted at the China International Exhibition Center in Beijing from April 23 to May 2, 2012. As luxury brands continue to whet China's appetite for high-end models, manufacturers are thinking green, putting focus on low-carbon vehicles. [Photo by Daniel Xu/China.org.cn]

Automakers from around the world show off their newest wares at the 2012 Beijing International Automotive Exhibition, hosted at the China International Exhibition Center in Beijing from April 23 to May 2, 2012. As luxury brands continue to whet China's appetite for high-end models, manufacturers are thinking green, putting focus on low-carbon vehicles. [Photo by Daniel Xu/China.org.cn]

Automakers from around the world show off their newest wares at the 2012 Beijing International Automotive Exhibition, hosted at the China International Exhibition Center in Beijing from April 23 to May 2, 2012. As luxury brands continue to whet China's appetite for high-end models, manufacturers are thinking green, putting focus on low-carbon vehicles. [Photo by Daniel Xu/China.org.cn]

Automakers from around the world show off their newest wares at the 2012 Beijing International Automotive Exhibition, hosted at the China International Exhibition Center in Beijing from April 23 to May 2, 2012. As luxury brands continue to whet China's appetite for high-end models, manufacturers are thinking green, putting focus on low-carbon vehicles. [Photo by Daniel Xu/China.org.cn]