城市植树所带来的经济效益据美国林业局不久前发表的一份研究报告说，从长远来看，在城市和郊区植树能够节省大笔开支，因为树林能够消除大气污染、改善环境等。这项历时３年的研究重点集中在芝加哥地区。研究人员估计，在库克县和杜佩奇县植树９．５万株，３０年后将带来... Economic Benefits of City Tree Planting According to a recent study released by the U.S. Forest Service, planting trees in urban and suburban areas can save significant costs in the long run as forests can eliminate air pollution and improve the environment. The three-year study focused on the Chicago area. Researchers estimate that planting 95,000 plants in Cook County and DuPage County will bring about 30 years ...