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森林是地球上绿色植被的主体,森林与我们人类的生存休戚与共,息息相关,所以有人说:“绿色就是生命”。我们知道,人类生存最基本的物质条件之一就是氧气。但如果空气中的氧气低于10%,二氧化碳超过2%时,人就会出现头晕、血压升高等不适现象,当二氧化碳超过8%时,人就有生命危险。而植树种草,增加大地绿色植物的覆盖面积,就可以保持空气的清新。据测算,
The forest is the main body of green vegetation on the earth. The forest is closely related to the survival of our human beings. Therefore, some people say: “Green is life.” We know that one of the most basic material conditions for human existence is oxygen. However, if the oxygen in the air is less than 10% and carbon dioxide exceeds 2%, people may experience dizziness, high blood pressure and other discomforts. When the carbon dioxide exceeds 8%, people are at risk. The planting of trees and grass, increasing the coverage of the earth and green plants, you can keep the air fresh. According to estimates,