答：Forests provide people with timber and also regulate the climate, maintain soil and water, prevent wind and sand, improve water quality, prevent smoke and dust, reduce noise, beautify the environment, and maintain and improve the ecological balance. Without green plants constantly producing oxygen and absorbing harmful gases, human would not be able to survive. People’s health is linked to the quality of air, which in turn is linked to the amount of forest. Many trees absorb harmful substances and carcinogens from the air. The green color of trees is pleasant to look at, helps to relieve tension and gives people a sense of beauty.
