How to trace the pattern of wealth disparity in this city—besides the widening chasm between super-luxury condos and the rest of the market, that is? Look for the trees. Or rather, for how many trees there are in your neighborhood. The Atlantic's CityLab shared findings of a study published in the journal PLOS One that found that in New York City, and in a handful of other cities (including Philadelphia and Baltimore), tree cover correlated with neighborhood income. In other words, the richer the area, the more trees there are and the denser the foliage.