evidence: The Intergovernmental Panel on Climate Change (IPCC), which reflects scientific opinion on the topic, stated in the forward to its 2013 report, "the science now shows with 95 percent certainty that human activity is the dominant cause of observed warming since the mid-20th century."3 And, several analyses of scholarly publications suggest widespread consensus among climate scientists on this point.4 [...] But, in the public eye, there is considerably less consensus. Just 27% of Americans say that "almost all" climate scientists hold human behavior responsible for climate change. Another 35% say more than half of climate scientists agree about this, while an equal share says that about fewer than half (20%) or almost no (15%) scientific experts believe that human behavior is the main contributing factor in climate change. [...] People’s perceptions of scientific consensus, even among liberal Democrats, are at odds with the near unanimity expressed in climate research publications that human activity is mostly responsible for climate change, however.7