The document discusses climatic hazards and how they interact with human populations. It defines climatic hazards as physical events caused by weather and climate that overlap with where people live, work, and travel. Specific examples of climatic hazards mentioned include tornadoes, hurricanes, cyclones, droughts, El Nino events, acid rain, ozone depletion, smog, and how urban and rural environments can modify local climates. The document also examines factors that influence the impacts of these hazards on people, how humans respond to hazards, and defines key terms like forecast, prediction, risk, and vulnerability in the context of natural hazards.