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近百年来,随着人类工业化的飞速发展,城市人口激增,商业性伐木和垦荒造田使原始森林等绿色生态系统遭到灾难性的破坏。尤其是亚洲许多国家的森林损失率已达60～90%,有的森林覆盖率已由50年前的60%降到了15%。绿化造林,维护生物多样化的生态平衡,其主要意义都是保护人类自身的生存和发展;另一方面,绿化造林对人类生活和生产释放的污染,起着积极的防治作用。森林等绿色植被对调节气候、涵养水潭、保持水土、防风固沙、净化空气、减弱噪声有积极作用外,还对当前人类共同关注的地球温室效应、城市热岛效应、酸雨、废水污染等问题,有积极的防治作用。一、防治地球温室效应人类等诸多生物之所以能生存在温暖适宜的地球上,主要靠大气中的CO_2产生温室效应所提供的,在一定意义上,人类需要这种适宜的温室效应。维持这个适当气温的CO_2含量为300PPM是比较合适的,一旦温室气体CO_2含量急剧增加,会引起强烈的温室效应反应,气温升高,导致诸多生物生存条件的恶化。
In the past century, with the rapid development of human industrialization, the urban population has surged, and commercial logging and reclamation of fields have devastated green ecosystems such as virgin forests. In many Asian countries in particular, forest loss rates have reached 60-90% and some forest cover has dropped from 60% 50 years ago to 15%. Green afforestation and maintaining the ecological balance of biodiversity have the main significance of protecting the survival and development of human beings. On the other hand, green afforestation plays a positive role in prevention and control of pollution caused by human life and production. The green vegetation such as forests and other green vegetation plays a positive role in regulating the climate, conserving the water pool, maintaining the soil and water, preventing wind and sand, purifying the air and reducing the noise. Besides, the current global human rights issues such as global warming, urban heat island effect, acid rain and wastewater pollution Positive prevention and treatment. First, the prevention and control of the global greenhouse effect Humans and many other organisms have been able to survive in a warm suitable for the Earth, mainly by atmospheric CO 2 greenhouse effect provided, in a certain sense, humans need this appropriate greenhouse effect. It is more appropriate to maintain this suitable temperature at 300PPM. Once the CO_2 content of greenhouse gases increases sharply, it will cause a strong greenhouse effect and the temperature will rise, resulting in the deterioration of many living conditions.