I found this quote ages ago but I can't remember who it was by but it was in reference to sustainable design.
"Perfect is the enemy of good. If we wait around for the perfect solution we will probably do nothing"
It really reflects my view on sustainable design and why I don't strive to design in the area of sustainability. There is always going to be someone out there who would point out all the negatives of a 'sustainable' product and criticise it for not being completely sustainable. But then if we did all wait around for the perfect solution then we wouldn't be getting anywhere and the environment would just be getting worse. We learn from our mistakes so even if we are just taking small steps towards sustainable design then it's better than nothing!