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一棵树,一年可以净化一辆汽车行驶16公里所排放的污染物。当城市绿化面积达到50%以上时,大气中的污染物可以得到有效控制。城市绿地面积每增加1%,当地夏季的气温可降低0.1摄氏度;宽30米的林带,可降低噪音6～8分贝……绿化的种种好处,78岁的王绍丰和72岁的张凤英可能说不周全。但这对生活在杭州西溪街道石灰桥社区的老人,却以一种朴素的坚持,守护着西溪河下的香樟树。26年来,他们沿河种下200多棵香樟,成活90棵。
A tree can clean up pollutants emitted by a car for 16 kilometers a year. When the urban greening area reaches more than 50%, the pollutants in the atmosphere can be effectively controlled. For every 1% increase in the urban green area, the temperature in the local summer can be reduced by 0.1 degrees Celsius. The forest belt with a width of 30 meters can reduce the noise by 6 ~ 8 decibels. The green benefits, the 78-year-old Wang Shaofeng and the 72-year-old Zhang Fengying may not be complete . However, the elderly living in the lime bridge community of Xixi Street in Hangzhou use a simple insistence on the camphor trees under Xixi River. For 26 years, they planted more than 200 camphor trees along the river and survived 90.