Add example of visualizing global carbon emissions time series

```
Describe the proposed enhancement...

http://www.eia.gov/cfapps/ipdbproject/iedindex3.cfm?tid=5&pid=5&aid=8&cid=region
s&syid=1980&eyid=2009&unit=MMTCD

Note: A URL of the an excel file of the data can be constructed by viewing the 
javascript in the page source.
```

Original issue reported on code.google.com by `tylerick...@gmail.com` on 29 Jan 2012 at 4:57
