Our two major allies - the US and the UK - are warning that Australia's national security is under threat, unless we take urgent action on climate change.

Experts interviewed for a new report by the Centre for Policy Development say we're lagging behind international defence strategies preparing for threats posed by food shortages, rising sea levels and more frequent natural disasters.

The report, 'The Longest Conflict: Australia's Climate Security Challenge', will be launched later this morning by retired Rear Admiral Neil Morisetti.

Morisetti is a former Climate and Security Envoy for the British Government, and joins James Carleton on RN Breakfast.