Without waiting for ICAO's global ETS, some nations and regional coalitions of nations have already implemented emissions trading programs applicable to airline operations nationally and/or regionally. Britain's exit from the European Union (Brexit) has complicated its relationship with the EU ETS scheme.

1. Identify one such nation or regional coalition of nations.
2. Describe the program and geographical extent of its coverage.
3. Distinguish the program from the present ICAO voluntary ETS program.
4. Identify issues and status of negotiations between the UK and EU to harmonize their trading schemes.