It's true: I used to walk about 1/2 mile unescorted to kindergarten everyday. I would never let my kids do that.
The report's author, Dr William Bird, the health adviser to Natural England and the organiser of a conference on nature and health on Monday, believes children's long-term mental health is at risk.Link (Thanks, Phil!)
He has compiled evidence that people are healthier and better adjusted if they get out into the countryside, parks or gardens.
Stress levels fall within minutes of seeing green spaces, he says. Even filling a home with flowers and plants can improve concentration and lower stress.
"If children haven't had contact with nature, they never develop a relationship with natural environment and they are unable to use it to cope with stress," he said.
"Studies have shown that people deprived of contact with nature were at greater risk of depression and anxiety. Children are getting less and less unsupervised time in the natural environment.
"They need time playing in the countryside, in parks and in gardens where they can explore, dig up the ground and build dens."
Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. His new book is Maker Dad: Lunch Box Guitars, Antigravity Jars, and 22 Other Incredibly Cool Father-Daughter DIY Projects