By The Numbers

By The Numbers

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St. Thomas, Mike
94—billions of dollars generated annually by recreational activity in national forests, according to a 1995 Forest Service study
19—billions of dollars generated annually by timber and mining in national forests, according to the same study

42—millions of acres of wilderness (roadless forest) in the western 48 states, according to a 2000 study
574—millions of dollars generated annually by recreation in this wilderness, according to the same study

8—cost, in billions of dollars, of a water-filtration plant that the EPA ordered New York City to build in 1989
2—billions of dollars that New York City spent to restore the Catskill Mountains watershed instead of constructing the plant

33—annual value, in trillions of dollars, of the entire planet’s ecosystem services, according to a 1997 estimate
18—value, in trillions of dollars, of the 1997 gross world product

122—annual cost per acre, in dollars, to re-create the environmental and economic benefits of a temporal forest, according to a 1997 study
228—annual value of the GNF, in millions of dollars, based on this estimate

Data from one of the following sources: 2000 John B. Loomis study, treesearch.fs.fed.us/pubs/6416; 1997 Robert Costanza et. al study,esd.ornl.gov/benefits_conference/nature_paper.pdf, Outside Magazine
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