Yes.
The term “nature deficit disorder” was coined by Richard Louv, who wrote the book Last Child in the Woods. He's actually an honorary chair of the Child and Nature Alliance and runs an organization called The Children and Nature Network in the States. It has a mandate very similar to what we do.
There's increased writing and research being done on the health, social, and economic outcomes of children not connecting to the natural world, and Mike has touched on a lot of them today. In Richard Louv's book, he talks a lot about nature deficit disorder being connected to ADD and ADHD at increasing levels and about diagnoses of those two disorders in school systems. Children aren't being given the opportunity to play and explore and run around and move their bodies in the same way that previous generations were given when they had more outdoor time and when phys ed classes happened both indoors and outdoors. There's definitely the behavioural and medical—