Here's her take on a broader question:
But why not shrink your wardrobe or move to a smaller house, given that less dry-cleaning would do more for the environment than saving the plastic bags? Or that the energy saved in heating and cooling a smaller house could be more substantial than what you save driving a Prius?
Everybody has to strike their own balance between how they want to live and how they can reduce their impact. If the environmental movement wants to be mainstream, it has to lose its purer-than-thou, all-or-nothing attitude. It has to be pragmatic enough to bring everyone onboard. If perfection is the measure, we will fail to appeal to anyone but the fringe.
Sure, I have a big house, but I use it to gather hundreds of people for eco-salons. That's not to justify the size of it, but it does create opportunities to spread knowledge and raise money for the greater environmental good. Sure, I could always cut down on clothes and dry-cleaning, but the point is not necessarily what more you could do -- we could all do more -- the point is that we do our part. And even with the house and clothes, I think I can do, and am doing, my part.