Using Tax Incentives to Conserve and Enhance Biodiversity in Europe. By CLARE SHINE [Strasbourg, Council of Europe Publishing, 2005, 110 pp, ISBN 9287157804, Paperback, 13]Species at Risk: Using Economic Incentives to Shelter Endangered Species on Private Lands. Edited by JASON F. SHOGREN [Austin, University of Texas Press, 2005, ix + 271 pp, ISBN 029270576X, Hardback, $50; ISBN 0292705972, Paperback, $21.95]