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...

This paper studies the growth impacts of realizing two long-term carbon targets in Switzerland (reducing CO2 emissions in 2050 by 72% and 80% relative to 1990 levels) with alternative steering-based climate policies that include a uniform tax on the whole economy and differentiated tax schemes....