Bilateral Graph

This is an example of a bilateral graph.  A bilateral graph can show 2 or more different sets of data on the same graph.   This graph shows trade of clean energy products between the United States and China.  The blue bars indicate exports, while the white bars indicate imports.  The red bars show the trade deficit.  It  is clear, that the US has been importing far more clean energy products than it has exported from 2006 to 2010.
http://www.theatlantic.com/international/archive/2010/10/china-and-international-rules-self-interested-or-malign/64747/