Over at eRedux you can take a look at the carbon output of each state in the US and compare them. If you click through in to the detail for any state you will get detailed information about each state.

The top two states in terms of absolute carbon output are Texas (670 million tons) and California (389 million tons), but the per-capita numbers are very different with Texans producing almost 3 times as much CO2 as Californians.

Top 5 & Bottom 5 States
This section of the chart shows the best 5 states in terms of per capita carbon output:

And this one shows the five worst performing states in terms of per capita carbon output: