A two-tier climate club exploits the comparative advantage of large countries to mete out punishments through trade, while taking their capacity to resist punishment as a constraint. Countries outside the coalition price carbon at a fixed fraction of the average carbon price adopted within the...

While an international agreement over the reduction of greenhouse gases (GHGs) emissions proves to be elusive, there is a large and growing support for investment in developing more effective technologies to adapt to climate change. We show that an increase in effectiveness of adaptation will...