Over thousands of years of human history, we have effectively become an indoor species. Particularly for those of us trapped in the cubicle life, often the only times we regularly step foot outside is for our daily work commute or to run errands. In 2001, a survey sponsored by the U.S. Environmental Protection Agency found that, on average, Americans spend 87 percent of their time indoors and 6 percent in an enclosed vehicle.
However, a number of scientific studies emphasize that reveling in the great outdoors promotes human health. Spending time in natural environments has been linked to lower stress levels, improved working memory and feeling more alive, among other positive attributes.