• Open Access Science Articles
  • Science Sessions: The PNAS Podcast Program
July 15, 2008; 105 (28)

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Cover image Ecosystems are natural capital assets that supply valuable services to people. Leaders worldwide face the challenge of developing incentives and institutions to guide wise investment in ecosystems. These maps illustrate the biodiversity status and ecosystem services as a function of land cover in Oregon's Willamette Basin. See the introduction to the special feature on pages 9455–9456. Image courtesy of Erik Nelson (Stanford University, Palo Alto, CA) and Heather Tallis (Stanford University, Palo Alto, CA).

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