Natural disasters occur as a result of weather or a natural event. Human-made disasters occur as a result of human action.

The health and safety of communities are directly impacted by disasters. Biological terrorism is the intentional release of biological agents to threaten populations and can lead to disaster and mass casualties.

disaster — any occurrence that causes destruction or human injury or loss that overwhelms the community’s available resources. natural disaster — disasters that arise from forces of nature, such as weather events (hurricanes, tornadoes, snowstorms, heat waves, and droughts), geological events (mudslides, floods…. biological terrorism — the intentional release of biological agents into the atmosphere or environment to threaten a civilian population. human-made disaster — directly caused by actions of people that inflict devastation and destruction of human life.