In 2008, the World Health Assembly formally recognized the health threats of climate change. In the following years, the focus of sustainable health care centered over the North Atlantic, particularly in Europe, North America and Australia, driven by health professionals and governments. Today, health systems in the Asia-Pacific region are accelerating decarbonization efforts the fastest. Global emissions from healthcare are equivalent to the fifth most polluting country in the world and will continue to rise without action. The Asia Pacific region accounts for 55% of global healthcare emissions, more than 50% of the global population and 90% of the climate risks affected by natural disasters. An aging population and expanding access to health care could increase the region's share of global health spending.