Courtesy of Michael Shermer, the following paper:
We analyze the evolution of the scientific consensus on anthropogenic global warming (AGW) in the peer-reviewed scientific literature, examining 11 944 climate abstracts from 1991–2011 matching the topics ‘global climate change’ or ‘global warming’. 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
I confess that I am curious about the ones expressing no position – that’d be something to examine further. But as I keep trying to tell my rightist colleagues, you only end up looking like fools when you try to argue against this.