The two countries, which will run the fortnight-long talks, have been accused by campaign group 350.org of a 'vacuum of action' on transitioning away from coal, gas and oil. Australia holds the role of 'president of negotiations' at the summit.
Preparations are expected to ramp up this week with a small preparatory meeting in Fiji and Tuvalu, attended by Australian Prime Minister Anthony Albanese and representatives from more than 50 countries. However, few leaders from outside the Pacific region accepted invitations, and some who confirmed have since cancelled, including Thailand's prime minister.
The criticism comes days after a New South Wales regulator approved the largest coalmine expansion in the state's history. The 19-year life extension for the Hunter Valley Operations thermal coalmine could lead to an estimated 809 million tonnes of carbon dioxide emissions if it receives federal approval.
A report by 350.org cited UN Comtrade data suggesting the supply of coking and thermal coal from Australia to Turkey had been responsible for more than 75 million tonnes of carbon dioxide emissions since the Paris climate agreement was signed in 2015. The report said the two countries are also expanding trade in liquefied natural gas.
The group noted that the Cop31 presidents have largely ignored fossil fuels in public comments ahead of the summit. Three letters setting out mission and expectations for the talks, two from the Turkish government and one from Australia, made little mention of phasing out fossil fuels.