I guess it's a kind of armchair environmentalism: it's easy to "go green" by switching to canvas bags (which _does_ help, a little), but then not make large, more sacrificial changes that would _actually_ benefit the environment. I don't know. It's tough, though, because to a large extent we're forced into lifestyles that are bad for the environment. You can't just decide to stop using the electricity produced by the coal power plant in your city, for example.