Step 1: Understand the event described.
The question refers to the first International Conference on Green AI, focused on making artificial intelligence more environmentally sustainable, held in January 2026.
Step 2: Eliminate the less likely hosts.
Dubai and Rome are common hosts for tech and climate summits but were not the venue this time, and Kabul does not host international AI conferences.
Step 3: Recall the actual host city.
Colombo, Sri Lanka hosted this first Green AI conference, marking the city's growing role in sustainability focused technology discussions.
\[ \boxed{\text{Colombo}} \]