& nbsp; Arbor Day is to protect, advocate people to plant trees, encourage people to love trees and remind people to pay attention to trees. Trees play a very important role in human survival and the ecological environment of the earth. China sets Arbor Day on March 12 every year, and the significance of Arbor Day is not that everyone should plant a tree on arbor day, but that through the coming of arbor day, we all pay more attention to greening and environmental protection. Arbor Day is stipulated in the form of law in China. It is a festival with the content of publicizing forest benefits and mobilizing the masses to participate in voluntary afforestation. It aims to stimulate people's love of forests and afforestation, improve people's understanding of forest functions, promote land greening, and achieve the purpose of protecting forests and improving ecological environment< br /> & nbsp; Cutting down a tree and wasting less paper is also our contribution to nature. Or choosing to travel does not have to be private cars. Bicycles, buses and subways (under construction) can also become your primary transportation. Choose low-carbon emission, afforestation and protect the environment. Start from green travel, protect nature and add a different kind of green to spring< br /> & nbsp; Ecological value of a tree < br / > & nbsp; A 50 year old tree, calculated cumulatively, produces oxygen worth about US $31200< br /> & nbsp; The value of absorbing toxic gases and preventing air pollution is about US $62500< br /> & nbsp; The value of increasing soil fertility is about 31200 US dollars< br /> & nbsp; Water conservation worth $37500< br /> & nbsp; Providing breeding sites for birds and other animals, worth US $31250< br /> & nbsp; Protein production is worth $2500< br /> & nbsp; Excluding the value of flowers, fruits and wood, the total value created is about 196000 US dollars< br />