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科学发展观的基本要求是全面、协调、可持续,可持续发展必须保持良好的生态生态失衡、气温升高、臭氧层变薄,动植物种群消失,严重威胁人类生存保持生态离不开种树,一棵普通树木每年可产生1吨氧气,树木还能吸收二氧化碳、调节气温涵养水源……按50年计算,一棵树产生的生态价值高达196250美元深思熟虑之后,河北省军区原副司令员张连印回到地处京津风沙源的家乡——
The basic requirements of the scientific concept of development is comprehensive, coordinated and sustainable development, sustainable development must maintain a good ecological and ecological imbalance, temperature, thinning of the ozone layer, the disappearance of flora and fauna, a serious threat to human survival to maintain ecological inseparable from planting trees, An ordinary tree can produce 1 ton of oxygen each year, trees can also absorb carbon dioxide, regulate the temperature to conserve water ... According to 50 years, the ecological value of a tree up to 196,250 US dollars After careful consideration, the former deputy commander of Hebei Province Zhang Lian back To the hometown of Beijing and Tianjin sand source -