Published in 2011 by Algonquin Books,The Nature Principle, Richard Louv's follow up book to Last Child in the Woods: Saving Our Children from Nature-Deficit Disorder, expands the focus beyond children to our society's needs for nature. He maintains that “reconnection to the natural world is fundamental to human health, well-being, spirit, and survival.” Richard sees seven integrated concepts of nature's “restorative and productive powers:”