Doomsayers are individuals or groups who predict catastrophic events or disasters, often claiming that society is on the brink of collapse. They may focus on various issues, such as environmental crises, economic downturns, or political instability. Their predictions can stem from historical patterns, scientific data, or personal beliefs. These predictions can influence public opinion and policy, sometimes leading to increased awareness or action regarding potential threats. While some doomsayers may be seen as alarmist, others argue that their warnings are necessary to prompt change and prevent future crises, particularly in relation to topics like climate change and nuclear proliferation.