Countries should impose carbon tariffs on imports from countries with weaker emissions rules

Exchange of goods, services, and capital across international borders governed by agreements and institutions.

Long-term shifts in Earth's climate driven by greenhouse-gas emissions and the global response.

Government and intergovernmental decisions on limiting greenhouse-gas emissions, adapting to climate impacts and financing the transition, including international negotiations, scientific assessment processes and national targets.

The study of how economic systems interact with ecological limits and natural-resource constraints.