What is an ecological disaster? What kind of environmental disasters are there?

What is an ecological disaster? What kind of environmental disasters are there? An example for each type of environmental disaster.

This is a relatively rapidly occurring chain of events leading to difficult reversible or irreversible processes in the natural environment (severe desertification or pollution, contamination), making it impossible to manage any type of economy, determining the danger of serious diseases or even death of people,
-natural (volcanic activity);
-technogenic (accidents at power plants)



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