Last December four large oil producers, Saudi Arabia, the US, Kuwait and Russia, refused to endorse the influential Intergovernmental Panel on Climate Change (IPCC) report which shows what the world could look like under 1.5C of warming.
The report was commissioned by the UN after the Paris Climate Agreement in 2015.
Now, with UN talks set to continue this week in Germany, Saudi Arabia still objects to the study being part of formal climate negotiations.
The talks are intended to "[raise] ambition to curb greenhouse gas emissions, accelerate resilience-building efforts, and ensure that climate policy is built on a solid foundation of the best available science and knowledge" in the light of the Paris accord, according to the UN.
“If countries are not able to agree on welcoming the report’s findings or doing anything with them, it’s awkward,” Carl Schleussner, head of climate science at the NGO Climate Analytics told Climate Home News.
A “gentlemen’s agreement” was believed to have been made before the meeting, meaning there could not be dedicated space for country representatives to discuss the key findings.
This means that discussions will finish next Wednesday even if no agreement has been reached.
“This is a gentlemen’s deal that is not very gentlemanly,” Jennifer Tollmann, policy advisor at think-tank E3G told Climate Home News.
The IPCC report looked at all available scientific literature and laid out what would happen if the Earth’s average temperature was allowed to increase by 1.5C compared to 2C.
It took more than two years to produce and included the assessment of more than 6,000 scientific studies. The aim was to help those in power to ward off climate change and support sustainable economic development.
Saudia Arabia’s senior negotiator Ayman Shasly has previously told Carbon Brief he does not wish to formally “welcome” the IPCC report.
He said: “You would not say things like, you ‘welcome’ it…because that [means] we are giving legitimacy to some scientific report…that had its own issues of scientific gaps, knowledge gaps,” he said.
He also criticised the report for not giving developing countries more generous carbon allowances.
CO2 emissions must be cut by 45 per cent from 2010 levels by 2030 to curb warming at 1.5C.
By 2050 the whole world needs to be at “net zero”, meaning any remaining CO2 being pumped into the atmosphere needs to be sucked back out somehow.