Study examines urban tree benefits/都市林の便益

アイダホ州南東部の77平方マイル(約200km2)、14万人が住む都市エリアを対象とした、空気や水質浄化や省エネ、人々の健康改善など都市林の便益評価結果が公表されています

--以下転載

  Air pollution negatively impacts human health, costing residents more in health care and in missed work and school days. The trees in the greater Pocatello and Idaho Falls areas remove 59 tons of air pollutants each year, reducing annual medical costs and lost productivity valued at $441,000 annually. A reduction in particulates and ozone are the greatest air quality benefits. Area trees also store more than 70,000 tons ($5.2 million) worth of carbon in their trunks, branches and roots, and remove an additional 1,470 tons ($105,000) of atmospheric carbon each year while providing nearly 2,000 tons of oxygen.

To protect water quality, federal stormwater rules require more stormwater be captured on site. Trees and green stormwater infrastructure are effective tools to do this, and the trees in these cities are already reducing runoff by 2.2 million cubic feet a year, a savings of $148,000 annually. Future increases in tree canopy adjacent to impervious surfaces can dramatically increase this benefit.

The energy saved by trees shading homes in the summer and blocking winter winds is also significant. In this area, trees save residents about $28,000 in heating costs and $167,000 in cooling costs for an overall savings of nearly $200,000 per year. Additionally, because less energy is used, less is produced at power plants, and this reduces the carbon they would otherwise put into the air; an additional savings of about $9,000 per year.
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  年間の都市林の便益合計を90万ドルと計上しています。このうち、医療費削減と病欠などの生産性減少防止の効果として44.1万ドルを計上している点が興味深いです。

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