A team of researchers from McGill and Université de Montréal’s Observatoire pour l’éducation et la santé des enfants (OPES, or observatory on children’s health and eduation), led by Sylvana Côté, found that spending two hours a week of class time in a natural environment can reduce emotional distress among 10- to 12-year-olds who had the most significant mental health problems before the program began.