The environmental footprint of an AI data center extends beyond electricity consumption, water requirements and hardware manufacturing. Cooling infrastructure introduces another important consideration that receives less attention in sustainability discussions: refrigerant leakage. As operators expand high-density computing environments, cooling systems must maintain demanding thermal conditions across critical infrastructure. These systems can use refrigerants with significantly different climate impacts, depending on their chemical composition and global warming potential. A leak involving a high-global-warming-potential refrigerant can create emissions that electricity consumption figures alone cannot capture. Refrigerant leakage receives less direct attention in many data center sustainability discussions than electricity efficiency, although disclosure practices vary across operators. This creates a challenge for enterprise customers seeking to understand the environmental implications of their computing arrangements. Refrigerant leakage reporting should therefore become a more visible part of environmental accountability across the AI data center industry.