Today's interview with author Austin Troy about his book The Very Hungry City... on WYPR today:
"How will Baltimore fare in the future as the global demand for energy grows and prices rise? Austin Troy, an expert in urban environmental management at the University of Vermont, looks at cities with "high energy metabolisms" and what they need to do about the problems of energy consumption. Troy is the author of The Very Hungry City: Will Your City Thrive or Wither in and Energy-Strapped Future?"
This author mentioned a strong statistical correlation between trees and crime: the numbers show that neighborhoods with more trees experience lower crime rates. So... go plant trees!
Also: people who live in places with extensive bicycle infrastructure are happier about where they live. Copenhagen and the Nordic countries were mentioned in this context.