The special initiative aims to protect people living in small island developing states from the health impacts of climate change by strengthening health systems with knowledge, resources and technology to respond to extreme weather events.
Effects of climate change such as rising sea levels and increasingly severe weather events are not only destroying homes, medical facilities and other essential services, but also threatening the overall health and safety of Pacific Islanders.
WHO's first assistant director-general for climate and other determinants of health Dr Joy St John opened the event in Nadi, Fiji.
"As a citizen of Barbados, another small island developing state, I understand how climate change is having such extreme impact on our countries," she said.
"This is why I am so passionate about this initiative and I am committed to pushing for practical solutions and action to address the heath impacts of climate change."
The event was also attended by Fiji's minister of health and medical services Rosy Sofia Akbar, the Cook Islands' minister of health, justice and parliamentary services Nandi Tuaine Glassie, and Dr Corinne Capuano, WHO director of Pacific technical support.