Tim Westbury is an international development practitioner with interests in climate security, human mobilities, regionalism and sustainable development. He has worked for the UN system over a 20-year period in Asia and the Pacific, including as Senior Sustainable Development Officer with UNESCAP in the Pacific. He holds a Master of Environmental Law from the University of Sydney and is undertaking a PhD at the University of Queensland focused on climate security and human mobility in the Pacific. This article is based on a policy brief published under the PCCMHS programme titled ‘Navigating human security and climate mobility in the Pacific Sea of Islands’.