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Ecosystem Services Program director Lydia Olander will deliver the keynote address at Ecosystem Services: From Concept to Policy in Washington, D.C., May 19. The symposium hosted by the American Association for the Advancement of Science & Technology Policy Fellowships will focus on how policy decision making at the national and international levels can improve use of our scientific understanding of the services provided to human societies by nature (ecosystem services). The event will promote discussions of the advantages and disadvantages of placing a monetary value on biodiversity and on developing and applying the associated valuation tools. It also aims to spark a conversation about what constitutes an ecosystem service.