Nature The Nurture Trees create an ecosystem by absorbing harmful gasses and producing oxygen. It also provides habitat and food for birds and other animals. One large tree can supply a day’s supply of oxygen for four people. Trees combat climate change Tress clean the air, provides oxygen Trees cool the streets and the city Trees conserve energy and save water Trees shield humans from ultra-violet rays Trees provide food, wood and medicines Trees create for economic opportunities Trees provided a canopy and habitats for wildlife