That leaves Ireland represented at the critical United Nations climate summit by one government minister, Eamon Ryan.
All three were due to attend part of the annual summit, which will take place this year in Baku, Azerbaijan, from November 11 to 22.
However, Taoiseach Simon Harris and Tánaiste and Foreign Affairs Minister Micheál Martin have decided to focus on matters close to home instead.
Their decision comes in a week when the UN said greenhouse gas emissions were still rising, the planet was on course for a “catastrophic” 3.1C temperature rise over the remainder of this century and the Cop29 talks would be crucial for pressing the need for immediate action.
In previous years, the Taoiseach of the day has travelled for the opening two days of Cop when the World Leaders’ Summit takes place.
Leaders from up to 190 countries each get a slot to address the gathering on their concerns and commitments around the climate crisis.
Foreign affairs ministers generally follow for several days to take part in high-level talks with multinational alliances about working on shared initiatives.
Other ministers and junior ministers, usually with portfolios in agriculture, finance and overseas aid, have also often attended for short periods.
Environment and Climate Action Minister Mr Ryan will deliver the address at the World Leaders’ Summit on Ireland’s behalf.
He will also be involved in talks on a new Cop agreement as part of the EU group of countries.
However, his main role this year is as one of a small group of senior ministers appointed by the Cop29 presidency to chair the overall negotiations.
He and his counterpart from Costa Rica will co-chair talks on the contentious issue of finance for climate “adaptation” – helping countries to prepare for the impacts of climate change and extreme weather events.
Wealthy countries have been slow to pay to help poorer nations put in place vital protections for their people and vulnerable economies.
Mr Ryan stood down as Green Party leader during the summer and is not running for re-election.
He will be back in Ireland for the last week or two of campaigning for the general election, which is expected to be held on November 29 or December 6.
