Edward O. Wilson
* Author, The Future of Life (Knopf, 2002)
* Pellegrino University Research Professor
* Honorary Curator of Entomology, Museum of Comparative Zoology, Harvard University, Cambridge, Massachusetts

Thomas Lovejoy
* Senior Adviser to the President, United Nations Foundation
* Senior Biodiversity Adviser, The World Bank, Washington, D.C.

Many scientists agree that we are in the midst of an extinction event. By one estimate half of the world's species may be gone by the end of this century. Scientists trying to protect biodiversity — the complete catalog of all living things — are working in the dark. No one even knows for sure how many species there are on Earth. In this hour, broadcast live from the American Association for the Advancement of Science meeting in Boston, we'll talk with two experts on biodiversity, Edward O. Wilson and Thomas Lovejoy.

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