In The March of Unreason, Dick Taverne expresses his concern that irrationality is on the rise in Western society, and argues that public opinion is increasingly dominated by unreflecting prejudice and an unwillingness to engage with factual evidence. Discussing topics such as genetically modified crops and foods, organic farming, the MMR vaccine, environmentalism, the precautionary principle, and the new anti-capitalist and anti-globalization movements, he argues that the rejection of the evidence-based approach nurtures a culture of suspicion, distrust, and cynicism, and leads to dogmatic assertion and intolerance. Science, with all the benefits it brings, is an essential part of a civilized and democratic society: it offers the most hopeful future for humankind.