The math is correct. Articles expressing no opinon do not fall into either catagory which obviously omits them from calculations.
"We find that 66.4% of abstracts expressed no position on AGW,
32.6% endorsed AGW, 0.7% rejected AGW and 0.3% were uncertain about the cause of global warming.
Among abstracts expressing a position on AGW, 97.1% endorsed the consensus position that humans are causing global warming."
Direct quote from the article. Notice how it says 32.6% of abstracts endorsed AGW. Thread title says 97% does.
Now see the second bolded part that says "
Among abstracts expressing a position on AGW". So they didn't like the low number of 32.6% and eliminated 66.4% of the abstracts so they could make it seem like its much higher at 97.1%. I do not deny that, of those with a position, 97.1% agree, because thats what the math shows. However, of all the abstracts reviewed, only 32.6% agreed on AGW.
Just because a definitive position isn't reached, doesn't mean that it isn't valid; that is a position in itself. To claim 97% of peer-reviewed literature agrees on AGW after you take out 66.4% of that literature, is extremely misleading. I do not agree or disagree with the findings of the study. I do, however, take issue with how misleading the thread title, op, and linked article are. That's like saying 100% of people agree that cats are awesome when only one person thinks that and three others don't care. That's not 100%, that's only 25% that love cats and 75% who don't care.
"We find that 75% of people don't care about cats and 25% of people love cats. Among those people who care about cats, 100% endorsed the consensus position that cats are awesome." -Cat scenario using same rational as article
Edit: Great point in the comments section from the link in the above post: "For thousands of years, the consensus was that the world was flat. And of course, it was back in those days… just ask anyone. But in time, the “deniers” continued to question the “consensus” and today we have an oblate spheroid instead of a flat planet." Just goes to show that a consensus is not always reality, but our current understanding of that reality and is subject to change at anytime.