Richard Tol University of Sussex   The Economic and Social Research Institute Whitaker Square, Sir John Rogerson''s Quay Dublin 2 Dublin, Ireland   r.tol@sussex.ac.uk   http://www.esri.ie/staff/view_all_staff/view/index.xml?id=215           JEL Areas: Q5 : Environmental Economics: General Q2 : Renewable Resources and Conservation: General