I study climate policy choices for a “policy bloc” of fuel-importers, when a “fringe” of other fuel importers have no climate policy, fuel exporters consume no fossil fuels, and importers produce no such fuels. The policy bloc and exporter blocs act strategically in fossil fuel markets....

We study optimal climate policy for a "policy bloc" of countries facing a market where emissions offsets can be purchased from a non-policy “fringe” of countries (such as for the CDM). Policy-bloc firms benefit from free quota allocations whose quantity is updated according to firms' past...