There is "Green" as in what's considered green and there is "Green" as in what the client wants when they ask for green.
As we all know the discussion about green can go on for ever.
However, what most clients want first and foremost is something that is not harmful for them, their kids and their pets in their home. Than if possible they want something that is not harmful to the environment.
What "not harmful to the environment" means, can again be a long discussion and there is no total agreement about it.
However, in this day and age, using some products that contain suspected carcinogens in them, like some manufacturers do, is beyond me.