Here’s a good article titled “Can we trust the IPCC”:
“Another lie taken up by climate skeptic folks is that the IPCC picks and chooses its sources by “systematically excluding ‘skeptical’ studies”. This is not true. Yes, as long as a study has been peer-reviewed and published in a scientific journal, the IPCC will consider all kinds of studies. Even those that attempt to challenge the impact of human activities on climate.”

https://bonpote.com/en/climate-can-we-really-trust-the-ipcc/#:~:text=Yes%2C%20as%20long%20as%20a,of%20human%20activities%20on%20climate.