This volume focuses on issues of vital interest in environmental policy making. Knowledge is needed about the impacts of economic processes on the environment and vice versa; people's preferences regarding the environmental quality (including the availability of (non)renewable natural resources) must be known; and knowledge concerning the effectiveness and efficiency of the available policy instruments is essential. These issues are dealt with in various contributions on environmental-economic modelling, valuation of the environment, the design of environmental policies and the economic consequences of environmental policy.