Formal negotiations will kick off on Monday following a meeting of heads of state last week in Belem, the gateway to the Amazon rainforest.
Australian Climate and Energy Minister Chris Bowen is due to attend the two-week Conference of the Parties summit, where last-minute lobbying for the rights to host the next round of United Nations climate talks will be a priority.
The Australia-Pacific co-bid has stalled as a competing bid from Turkey remains in play, with no location set and just 12 months to prepare.
Australia has been gunning to host the 2026 conference to attract international investment in clean industries and strengthen its relationship with strategically important Pacific neighbours.
The annual talks take place at a strained time for global co-operation on responding to the challenges of temperature rise.
The US government has been actively pulling back and so far, Europe has not stepped in to fill the void as assertively as it has during other periods of faltering climate ambition.
And while pollution-slashing promises have the world tracking towards less warming than the troubling trajectory that first spurred Paris into existence a decade ago, the pact's stated goals of keeping temperature rise below 2C, ideally 1.5C, are still off track.
The gap between emission reduction commitments and temperature limits is expected to dominate the event, as well as discussions on adaptation, climate finance and phasing down fossil fuels.
Carbon-absorbing forests will also be given prominence thanks to the symbolic location in the Amazon rainforests, known as the "lungs of the world".
9°C