see relax north plant show health with but much science |
The "Great Green Wall of China" project is over forty years old. In this project, people plant trees in part of China. Why are trees so important to us?
Because it is healthy to live around trees. They can keep us , just like doctors. So we call them "doctor trees".
Trees can clean the air. For people in large cities air pollution, trees can be very important. Workers are trees not just in city parks also along streets to help clean the air.
Some think that trees not just help clean the air. They are also good for our health. A study that people in hospitals feel better when trees from their rooms. And people with trees near their homes usually exercise more.
Scientists are also studying the healthy effects (作用) of trees on human minds. One effect of trees is that they make people feel happy and . When people go through the neighborhood with more trees, they will walk slower and talk often with each other.
Of course, another good effect is that "doctor trees" work for free! Writing 3
