Well ... Lars is right that the implementation allows each national Greenpeace organization full control over their own content.
But within each national organization's view of their content management system, content can be tagged as to language. So they can provide the same content in multiple languages if they want.
However it's not terribly well thought out IMO (Lars and I both worked on this system but it was designed by an earlier firm whose contract was terminated by Greenpeace after it became apparent they wouldn't finish in finite time). It will work but it will be somewhat clumsy.
Thus far Greenpeace hasn't migrated any multilingual national organizations over to the site, as both the International and Netherlands sites are single-language. When organizations like Greenpeace Belgium (Dutch/French) and Canada (English/French) come on board you'll then see sites that presumably will present the same content in two languages.
