Stephen Kellert's new book "Birthright: People and Nature in the Modern World" talks about creating a connection with nature to build "our existence".

Stephen Kellert says that in 99 percent of all histories of mankind, humans existed in nature and not in some artificial or man-made world. This makes humans deeply "attuned to the resident rhythms and stimuli that originate in the natural world."

Kellert also says that it's important to find nature in the cities we live in. 89 percent of American citizens live in an urban environment which is built and caters to human habits that have been inculcated over the years. Getting in touch with nature is all about "creating good habitat for people even in our urban settings."

Kellert says that "Tree planting is part of that, but also the interior of buildings and the facades of buildings can be inspired and mimic and simulate natural patterns and processes."

Kellert narrates the incident when he and some of his friends were humbled by a pack of wolfs that they encountered while wandering deep into the forest.

"We were out in the deep of night in northern Minnesota. Eventually we were surrounded by wolves, and I could feel the terror of being a relatively vulnerable prey species with this large predator and it was a very humbling experience, but at the same time it was an awesome experience. I came to appreciate the wolf in a way I never had before through my intellectual studies.