> The IPCC doesn't do any research themselves and don't check the data, its a meta-study.
The people writing the chapters are involved in doing the research. (It's not like doing that is a full-time job, mind.)
> What started my skepticism was when I realized they don't actually know how much human co2 emissions affect the temperature. Go try and find that number, you won't find it cause we don't know.
For anyone wondering, look here:
https://en.wikipedia.org/wiki/Climate_sensitivity
Short answer - doubling the atmospheric CO2 should lead to an increase between 1.5 and 4.5°C, though more current work I remember narrowed the range down somewhere around 2.3°C-3°C. There is a lot of work down to narrow it down further.