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 ...
