Five oceans are in the world, which are the Arctic, Atlantic, Indian, Pacific and Southern.
Many people decided to move from more rural areas that offered land and space for farming to cities that had factories and offered job opportunities
As a peninsula, the people of Greece took advantage of living by the sea. The mountains in Greece did not have fertile soil good for growing crops, like in Mesopotamia, but the mild climate allowed for some farming. The Greeks, like many other ancient civilizations, felt deeply connected to the land they lived on.
I hope that helps you. :)
I would have to go with Sewage mostly because it smells and because it can really hurt the environment. Plants can die and it just is gross to smell. So this would definitely pollute the earth. I hope this helped! :D