About "Go green".. there is a play on words that would be missed in the translation, for "green" makes reference to:
Eco-friendly = Ecológico
The color, that could have the connotation of somthing positive, free from restrictions, without limits (this has to do with the traffic light) = Verde (is spanish we usually say "luz verde")
In this particular example we can't include all this in the translation, somthing will be lost in the process.
have a good day and don't hesitate to correct my mistakes, I'll be thankful.