:)
I would just repeat myself. Trade unions should be concerned whenever their members are concerned in aspects related to their work. If green stuff is, let there be green then. If areas of interests of NGOs, civil associations, unions, intersect, I don't see a problem in getting involved from each of the concerned party.
By mentioning environment, I meant green issues unrelated to a certain industry and their unions.
I also mentioned deceitful publicity. I said I don't see unions getting into it, except directly concerning its members in work related matters.

I'm repeating myself.

Free at last! Free at last! Thank God Almighty, we are free at last! (Martin Luther King)