Research has also shown similar benefits to simply being around nature. One study showed that spending time in natural settings makes us more generous and more community-oriented, a conclusion that has "implications not only for city planning but also for indoor design and architecture," according to the study's co-author Richard Ryan, of the University of Rochester Medical Center. Another study by Dutch researchers showed that those who live within 1 kilometer of a park or wooded area suffer lower rates of depression and anxiety. Even if we don't live amid trees and greenery, we can always take a walk through them. And when scaled up, this could have real societal consequences. "As health-care costs spiral out of control, it behooves us to think about our green space in terms of preventive health care," said Dr. Kathryn Kotrla, of the Texas A&M College of Medicine.