Scientists have now spoken out against the 40% figure contained in the IPCC report and say that recent research is suggesting that the rainforest may be more resilient to climate change than had been previously thought.
It comes just days after the UN announced an independent review into the panel's procedures following a series of scandals over its most recent report which was found to contain factual errors and claims which were not based on rigorous scientific research.
The InterAcademy Council, which is the umbrella organisation for the national academies of science around the world, will examine how the IPCC's reports are compiled and communicated.
Dr Jose Marengo, a climate scientist with the Brazilian National Institute for Space Research and a member of the IPCC, said the latest study on the Amazon's response to drought highlighted the errors in the previous claims.
He said: "The way the WWF report calculated this 40% was totally wrong, while (the new) calculations are by far more reliable and correct." Read more.