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  1. Defining “Biodiversity”; Assessing Biodiversity.Sahotra Sarkar - 2001 - The Monist 85 (1):131-155.
    This paper analyzes the concept of biodiversity in conservation biology and assesses potential methods for its measurement.
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  • The value of the world's ecosystem services and natural capital.Robert Costanza, Ralph D'Arge, Rudolf de Groot, Stephen Farber, Monica Grasso, Bruce Hannon, Karin Limburg, Shahid Naeem, Robert V. O'Neill, Jose Paruelo, Robert G. Raskin, Paul Sutton & Marjan van den Belt - 1997 - Nature 387 (6630):253-260.
    The services of ecological systems and the natural capital stocks that produce them are critical to the functioning of the Earth's life-support system. They contribute to human welfare, both directly and indirectly, and therefore represent part of the total economic value of the planet. We have estimated the current economic value of 17 ecosystem services for 16 biomes, based on published studies and a few original calculations. For the entire biosphere, the value is estimated to be in the range of (...)
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