it starts out with the same old tired assumptions. for some reason (probably because the report is locked) I can't crtl+C crtl+V quotes here:
But Page 2-4 right in the introduction it notes that we are two degrees (in freedom units) warmer than we were in the late 1800s. and says there is no known natural process for this. That quote, nor at least the first two citations, even note that we were in a mini-Ice Age before that period. and it seems lazy AF to say there is no natural process that causes the earth to warm.
even in the citations they point out the limitations of what they are looking at. they point out that ONE natural system is likely not the cause of temperature increases, and then just jumps to man made causes. nothing in between. there are apparently only two POSSIBLE causes. "As highlighted in Chapters 2 to 4 of this Report, it is
likely that there have been observational changes in the extratropical jets and mid-latitude jet meandering (
Section 2.3.1.4.3 and Cross-Chapter Box 10.1). There is
low confidence in possible effects of Arctic warming on mid-latitude temperature extremes (Cross-Chapter Box 10.1). A large portion of the multi-decadal changes in extreme temperature remains after the removal of the effect of these modes of variability, and can be attributed to human influence (
Kamae et al., 2017b;
Wan et al., 2019). "
https://www.ipcc.ch/report/ar6/wg1/chapter/chapter-11/
in that reports Chapter 3, they dismiss TWO natural causes. and says volcanic activity is not a cause for long term change when we know it has been in the past. and even one of their citations states as much.
"These findings indicate that volcanism is a major cause for the deviations between the actual and predicted [
Flato et al.,
2013] global warming since year 2000."
I certainly don't have time to read the 1800 pages of NCA5, nor all of its citations, but it seems like it starts off with the same assumptions, and ignores the parts of its citations that doesn't fit that predetermined assumption.