This is the 17284th most frequent Russian word.
существованию
"Existence."
In this sentence, the word "существованию" (dative case) refers to the act of existence, emphasizing the state of being of the subject described.
Её существованию угрожала надвигающаяся буря.
Its existence was threatened by the approaching storm.
Here, "существованию" (dative case) symbolizes the continuing existence or survival, particularly in the context of humanity's reliance on the environment.
Сохранение окружающей среды необходимо для существованию человечества.
Preserving the environment is necessary for the existence of humanity.
In this example, "существованию" (dative case) represents the concept of existence, associated with a collective human experience.