In an interview published on the website Climate Diplomacy, Mr Waqa says the position would fill a "critical gap" in the UN system.
Baron Waqa said Pacific nations were seeking a more robust response on climate change from the UN.
The special representative on climate and security would update the UN secretary-general's report on the security impacts of climate change.
It would also produce a new report analysing the dangers of climate security and make recommendations for monitoring and response.
