How neighborly is your city's electric car fleet?
Replacing a gas-powered car with an electric model takes a lot of emissions out of the air in the local area over the car's lifetime, and adds some emissions at power plants far away. In some cases, a single electric car can do hundreds of dollars of environmental damage to a distant county over its lifetime by increasing pollutants like NOx, SO2, and particulate matter. Click on each city to see the county-level environmental benefits (and costs) of choosing an electric Ford Focus over a conventional one and driving it for 150k miles. 
Note: In some counties, damages and benefits range well above $100.
Source: adapted from supplemental maps in the online appendix to Holland et al. (2016)