In this work describes the hazards that have catastrophic consequences for people and the environment. In the first plan hazards such as fires, floods, landslides and earthquakes have been placed. A more detailed analysis of their harmful effects on the environment and people is given. Particular importance is given to preventive measures, consequences and remediation of damage caused by catastrophic events. The aim of this paper is to present as many hazards as possible (fires, floods, landslides and earthquakes) with the consequences that it can cause.