April 7, 2006
Putting a Price Tag on the Planet
How much are ecosystems worth to humans? More than you might think.
As the 20th century drew to a close, leaders in the field of ecology decided they were failing at one of their primary goals. They had presented sign after sign that people were harming the environment — killing off species, destroying rain forests, polluting the air and water — but the warnings had little effect. So, to encourage conservation, they decided to appeal to humanity's baser
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