The 2016 agreement to phase down hydrofluorocarbons (HFCs) was adopted in…

Concept

For a venue-based international-agreement question, first identify the city in the official adoption record, then map that city to its country. This separates the agreement fact from other conferences held around the same time.

Application

1. The UN Ozone Secretariat records that the HFC phase-down amendment was adopted at the Twenty-Eighth Meeting of the Parties in Kigali on 15 October 2016.

2. Kigali is the capital of Rwanda, so the country is Rwanda.

Cross-check and contrast

A country-to-capital comparison independently confirms the mapping.

Result: Rwanda.