"Deniers" typically refer to individuals or groups who reject established facts or scientific consensus on specific issues, often related to topics like climate change, evolution, or historical events. They may question the validity of evidence presented by experts and often promote alternative explanations that lack scientific support. This phenomenon can be observed in various fields, such as climate science, where some deny the impact of human activity on global warming. Deniers may use selective information or misinformation to support their views, which can hinder public understanding and policy-making related to critical issues like environmental protection and public health.