Did you know that a mature tree produces enough oxygen in one day for four people? There is a reason why time spent among the trees makes us feel good. Trees clean and freshen the air we breathe. They reduce carbon dioxide and remove many pollutants. When you consider the life span of a tree, it is a real bargain. What else can you plant in your landscape that provides years of beauty, helps cool your house in summer, provides habitat for wildlife, and cover for shade-loving plants? In the winter trees offer shelter to more tender plants from frost.