This is the 86th most frequent Polish word.
świata
"Świata" means "of the world" in English.
In this sentence, 'świat' is in its nominative form and refers to the concept of the world as a whole.
Nie mam pomysłu, jak uratować świat.
I have no idea how to save the world.
In this context, 'świata' is also in the genitive case, used after the noun 'końcu' to specify the object of the ending.
Po końcu świata zaczęła się nowa era.
After the end of the world, a new era began.
Here, 'świata' is in the genitive case, used due to the preposition 'dookoła,' indicating the action of traveling around the world.