Green design?

I was reading an article today about how to be greener as a designer and ended up watching this interesting video about bottled water and tap water.

The thing that strikes me most though is not the “stupidity” of people who bought or tasted the water in this case but more the cleverness and ingeniosity of the designers that manage to give this image of a better product for you. On a  general, capitalist point of view we can’t deny these designers realised a seriously good job as they manage to give a better image of the products than they really are but  in the end their work is all but green as they make consumers buy things they don’t need… I’m then simply wondering if designers are green at all as their aim is to promote products that are of no use in most cases… I’d really appreciate if some of you could give their opinion on this subject and let me know if they think that designers can genuinely be green (or maybe even greener)…