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伐木工人早就能计算一片森林板材的价格,农民也知道每棵果树的价值,但是直到20世纪末,还没有人能回答树木在多大程度上改善了城市环境这个问题。1905年4月8日,西奥多·罗斯福总统身穿深色衣服头戴高顶帽,在得克萨斯州的艾斯堡市挖坑种树,这一天是美国的植树节,全国各地的学校开始举行相关活动,总统用实际行动证明了自己对树木的热爱,而摄影师把这一时刻永远记录了下来。对罗斯福来说,植树节不是公共宣传的噱头,几年之后,在对学生的一次演讲中,罗斯福宣扬树木对国家的重要性,认为树木具有装饰作用,也有实际用
Lumberjacks have long been able to calculate the price of a forest sheet and farmers know the value of each fruit tree, but until the end of the twentieth century no one could answer the question of how much the tree has improved the urban environment. On April 8, 1905, President Theodore Roosevelt wore a dark top with a hat and plowed trees in the city of Espoo, Texas, on a tree planting day in the United States, beginning with schools throughout the country Hold the relevant activities, the President proved his love of trees with the actual action, and the photographer will never record this moment down. For Roosevelt, Arbor Day was not a gimmick for publicity. A few years later, in a speech to students, Roosevelt preached the importance of trees to the country, believing that the trees had a decorative effect and that they were actually used