Ok, give me the details on the chart and we can assess it.
Which report did it come from?
What page?
Which models does it project?
What year was that model?
Is it the most recent model?
What are the numbers used in the graph?
What is the last year of climate data entered?
Where is the data posted?
Is it included in the model listing in this chapter?
https://www.ipcc.ch/pdf/assessment-report/ar5/wg1/WG1AR5_Chapter09_FINAL.pdf
As a stickler for accuracy, you should have no problems answering those questions.
And as someone who has a high threshold for accuracy, I assume you know the answers to all of those questions.