Answer:
Against the sun I protect your eyes and am often worn on the face of spies
I have cities with no people forests with no trees and oceans with no water.
What has 4 fingers and a thumb but isn't alive?
People buy me to eat but never eat me. What am I?
I keep things green and keep kids happy during summer time.
The answer I give is yes, but what I mean is no. What was the question?