Cook et al., 2013: reviewed 11,944 climate abstracts. 66.4% took no position, 32.6% endorsed human-caused warming and 0.7% rejected it. The 97.1% figure counts only abstracts that took a position.
Among abstracts expressing a position on AGW, 97.1% endorsed the consensus position that humans are causing global warming.
Cook et al., 2013: reviewed 11,944 climate abstracts. 66.4% took no position, 32.6% endorsed human-caused warming and 0.7% rejected it. The 97.1% figure counts only abstracts that took a position.