Bilateral Graph

http://www.energytribune.com/974/green-energy-advocate-amory-lovins-guru-or-fakir#sthash.o114zo0G.dpbs

As suggested in the name, a bilateral graph is a graphs that displays the relationship between to or more different sets of variables. This graph is showing the correlation between energy used per capita and energy use per dollar GDP from 1980 to 2030. As you can see there since 1980 there was a steady, yet significant decrease in energy use per dollar GDP. Also, since 1980 there was a slow and steady increase in energy use per capita.