Some the concerns raised here were addressed in the survey. Check out this quote from this Arstechnica article.
About 33 percent of abstracts were categorized as endorsing the consensus, with 0.7 percent rejecting it. The remainder made no statement discernible as either. So among the abstracts with a clearly-stated position, 97.1 percent backed the consensus.
But what about the others? Did those abstracts not state a position because the consensus is so well-accepted as to make doing so unnecessary? Or was the human impact on climate often presented as uncertain in these papers? To answer this question (and further verify the ratings of the other abstracts) the group sent a survey to the authors whose email addresses were listed with the papers—over 8,500 in total. The survey was completed by 1,200 of them, who rated their own abstracts using the same criteria as the research group.
Of the abstracts that the research group had rated as not expressing a position the authors rated more than half of the papers as endorsing the consensus. Overall, 62.7 percent were self-rated as endorsing the consensus, 1.8 percent as rejecting the consensus, and 35.5 percent as having given no position.
So of those that expressed a position, 97.2 percent endorsed the consensus and 2.8 percent rejected it according to the authors of those papers.
I see it as pretty clear that the scientific consesus is that anthropogenic global warming is occurring. There is not considerable disagreement among climate scientists.