In search of compelling visualizations to explain CO2 use and savings, I've come across  Information is Beautiful, a blog collection of 'qulaity' visualizations by David McCandless is a source of delight and inspiration for the how-to-explain-this-so-people-will-get-it moments that occur more and more frequently.

See this, which caught my eye. This is information I actually wanted to know. 

Very complex issue, well explained in pictures/metaphor:

Dave's new book is going on the wishlist right now.