Natural and environmental disasters in history (depending on the evaluation of human influence), their perception, their consequences and the handling of catastrophes by society; including events with potential catastrophic impact such as avalanches, fires or floods.

The author investigates the influence of natural disaster  - landslide, which affected the river Soča in Slovenia. He describes how pollution reflects in population of fish species, invertebrates an flora in the area from Čezsoča to Tolmin.