I love how opinions are now scientific facts...!
Well said.
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.