the rest of the world uses green.
Only if you define the rest of the world to mean the very small percentage of places in the world you have been.
From Wikipedia:
In some countries, instead of "don't walk", a depiction of a red man or hand indicating when not to cross, the drawing of the person crossing appears with an "X" drawn over it.
Some countries around the Baltic Sea in Scandinavia duplicate the red light. Instead of one red light, there are two which both illuminate at the same time.