In 2019, a social psychologist, Mathew White of the European Centre for Environment & Human Health at the University of Exeter, studied the effects of spending weekly time in green spaces - local parks or other natural environments, either all at once or spaced over several visits. Of 20,000 people studied, those who go outside for at least two hours a week are substantially more likely to report good health and psychological well-being than those who don't, regardless of their demographics.