I believe that it is actually something akin to "97% of climate scientists writing on the subject of AGM remain in agreement on the conclusions of their own writings."  In actuality, it seems that about 2/3 of climate scientists expressed no AGW position when this number first hit the news (from the 2013 Cook literature study). This is not to indicate a disbelief in man's contribution to AGW, but to point out that the 97% number is too often misused.