We derive the optimal contributions to global climate policy when countries differ with respect to income level and pollution intensity. Countries' growth rates are determined endogenously, and abatement efficiency is improved by technical progress. We show that country heterogeneity has a...

As the European carbon border adjustment (CBA) mechanism is high up on the European Commission's agenda and soon to be implemented, it is important to understand the economic and environmental implications of alternative designs of such a mechanism. To this end and with a view to informing the...