उत्तर : 2. "न्यूयॉर्क"
व्याख्या :

1. The United Nations Climate Ambition Summit was held in New York on September 20, 2023.

2. UN Secretary-General Antonio Guterres hosted the UN Climate Ambition Summit.

3. The main objective of the summit is to accelerate climate action as part of the 28th Conference of Parties (COP28).