John Timmer at Ars Technica looks at what a survey of Australians about their beliefs regarding climate change can tell us about our perceptions of popular opinion:
The false consensus effect became obvious when the researchers looked at what these people thought that everyone else believed. Here, the false consensus effect was obvious: every single group believed that their opinion represented the plurality view of the population. This was most dramatic among those who don’t think that the climate is changing; even though they represent far less than 10 percent of the population, they believed that over 40 percent of Australians shared their views. Those who profess ignorance also believed they had lots of company, estimating that their view was shared by a quarter of the populace. [...]
But there was also evidence of pluralistic ignorance. Every single group grossly overestimated the number of people who were unsure about climate change or convinced it wasn’t occurring. Even those who were convinced that humans were changing the climate put 20 percent of Australians into each of these two groups.
In the end, the false consensus effect is swamped by this pluralistic ignorance. Even though everybody tends to think their own position is the plurality, those who accept climate change is real still underestimate how many people share their views. Meanwhile, everyone overestimates the self-labelled “skeptic” population.