There are many reasons for transitioning out from a fossil fuels based economy (a conviction in climate change, foreign energy independence, etc) but nothing will happen until we’re able to identify what we can change.
Enter the The Vulcan Project. This joint NASA-Department of Energy project aims to provide detailed analysis of carbon emissions per each kilometer in the United States. According to Wired, the project has already drawn some controversy, since the northeast U.S. seems to be emitting less carbon than previously thought, while the coal-driven southeast produces more than previously thought. It would be pretty cool to map this to congressional districts, although we’d have to constantly adjust for gerrymandering, I’m sure.