植树造林造福人类的千秋大业碧霞，老夏植树造林，是造福人类的千秋大业，科学测算，主要作用表现在六个方面：净化空气，改善环境。测试表明，树叶表面长有一层茸毛，能分泌出粘性油脂物，像粘附剂和吸尘器一样，１公顷林木，一年可吸收尘埃３００──９００公斤，吸收有... Afforestation for the benefit of mankind’s golden andes Bixia, Lao Xia afforestation, is the benefit of mankind’s great cause, scientific measurement, the main role in six areas: clean air and improve the environment. Tests showed that the leaf surface has a layer of hair, can secrete viscous oils, like adhesives and vacuum cleaners, 1 hectare trees, a year to absorb dust 300 ─ ─ 900 kilograms, absorb ...