The solutions have potentially huge cascading effects: Obviously, a more pedestrian-friendly infrastructure leads to fewer cars and less environmental pollution, but it also creates more opportunities for physical activity and socialization and, therefore, healthier and happier populations.

FORBES: Can We Design Our Way to a Healthier America?

The Environmental Protection Agency consistently ranks hazardous-waste sites as less harmful to human health than radon, outdoor particulate pollution or working exposure to pesticides.

ECONOMIST: Race and the environment