From climate change to vaccines, there’s a worrying tendency in our culture to bury our heads in the sand, and for a growing number of people to turn their backs on the truth. At its most dangerous, denialism can shade into extremism.

Denialism is fundamentally a rejection of reality, but what drives it? What does it say about our psychology that sometimes we need to protect ourselves from what’s really going on? And what should we do about the malign online forces that are driving more people to construct their own truth?

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Produced by James Shield.

Brought to you by the RSA (Royal Society for the encouragement of Arts, Manufactures and Commerce).