Let us assume, for purposes of discussion, that the first bolded section is indeed "a fact."
If it is, then the second bolded section is also probably a fact. But doesn't it make a rather dramatically critical difference whether the "in part" refers to 1% responsibility or 99%?
It is highly unlikely man has had NO impact on climate. It is also highly unlikely we are the primary factor.
Liberal guilt, New Age philosophy makes me 100% responsible for everything that happens in the Universe. Sucks to be guilty of everything. It's sorta like Judaism without God. Instead of atoning for your sins by sacrificing a ram or a calf or a couple of doves you get to sacrifice your commonsense, self-esteem and instinct for self-preservation....