Labor did not say which COP conference it would bid for, referring only to a "future" summit.
However, host countries for the next two years — Egypt (2022) and United Arab Emirates (2023) — had already been announced before the promise was made.
The next available conference (COP29) will be held in 2024, with the host to be formally decided at the 2023 conference.
COP conferences are generally held in November and December, meaning the 2025 conference will likely fall beyond the next federal election, although the government could still submit a bid to host this summit.
Typically the host country holds the COP presidency, which each year moves among five regional groupings. In 2024, first choice belongs to a country from Eastern Europe, though the group can agree to relinquish its turn.
According to a UN Framework Convention on Climate Change (UNFCCC) handbook:
"The regional groups hold consultations to determine which country from their region will offer to host on behalf of the group. Once agreed, the chair of that regional group formally sends an expression of interest to the [UNFCCC] secretariat."
It added: "The COP usually takes note of the offer in a decision on the dates and venues of future sessions."
Labor said it would "bid to co-host" a conference, although Australia and Pacific Island nations belong to different regional groups.
A pre-election report by The Australia Institute explained that this meant "Pacific countries would not be formally involved in the bidding".
But it said Pacific countries could be consulted as a partner, for example, helping to determine themes and announcements or hosting formal preparatory meetings in the months leading up to the conference.
This promise will be delivered if, before the next federal election, the UNFCCC secretariat receives an offer from Australia to host a COP climate conference, and if Pacific Island nations have agreed to participate as partners.
Here's how the promise is tracking: