Which is a contribution of classical greece to modern western civilization?

Of all the cultures to have influenced contemporary Western civilization, Ancient Greece is perhaps the most powerful. The imprint of the ancient Greeks on Western society spans such diverse areas as politics, philosophy, science, art, architecture and sports. Additionally, according to History-World.org, the impact of Greek literature cannot possibly be overestimated.

There are many contributions of classical Greece in the modern Western civilization, but here a just a few.
   1. Politics 
   2. Art
   3. Science
   4. Philosophy.
I hope this answered your question. 

Hoped he would accept their demands and end the violence