Look around different neighborhoods in the city and you might see green, or in many cases, the brown of paved surfaces. The greenness of different neighborhoods and cities around the country has actually been measured. New York for instance scores pretty high, Fresno is toward the bottom of the heap, and LA is pretty much right in the middle.

But what does that actually mean for the people that live in those areas?

A new project lead by environmental historian Jon Christensen is seeking to find out. He's mapped out the greenness of cities around the country and compared that with data about wealth, crime, infrastructure.