A proposal has been made to build a new tunnel under the Scheldt River near the centre of Antwerp in order to relieve traffic congestion on the ring road and in an existing tunnel. The new tunnel is expected to cost more than €1 billion, and tolls have been suggested to help finance...

In this paper, we explore energy efficiency policies in the presence of a global environmental problem and international cost interdependency associated with R&D activities. We develop a simple model with two regions where the cost of an appliance in one region depends upon the level of energy...