More than 50% of your body heat is lost through your head. That's why in the wintertime we wear a toque (a woolen hat).
Environmental Monitoring
Tree rings are able to tell scientists about past and present climates. This is extremely important as today we are facing global climate change. In addition, trees purify the air especially in our polluted urban centres. Stanley Park in Vancouver or Central Park in NYC provide great examples of trees helping humans in an urban environment. Global Forest is monitoring the state of both animals and trees as they are affected by global change.