Essays / exemplification essay for my English class/ global pollution/waste management [5]

i got an essay assigned in my english class. english is the class i struggle in the most, im more of a math and science person, well anyways my teacher doesnt really explain much and just gives assignments expecting us to know or figure out the correct way its supposed to be. i was thinking of writing it on global pollution/waste management. using examples like the north american trash vortex. im not sure if i need many examples or just a few. maybe another topic would be better but i cant think of any others...thanks..