In buying stuff, I was reminded of a comment somewhere of living "plastic-free". So-- what does one use? Wood? Paper, metal, ceramic, stone, brick, animal hair, and textiles? And how does the environment sustain a growing population that might also choose to be plastic free? And in so making this choice, don't you have to throw away whatever plastic you currently have, including your car? That only makes sense if a few people do it, really. Like the communities that eschew personal material gain, like the Hutterites, or most modern conveniences, like the Amish... who prefer to live plainly.
I doubt anyone here will want to do that, because it involves getting rid of your action figures and DVDS, and so forth. Mm... nah. Not acceptable.

Addendum: found the blog, which clarifies a number of things about this movement:
http://plasticfree.blogspot.com/Can't say I agree with this person is saying some plastic is not biodegradable. All plastic breaks down, in fact everything breaks down if its exposed to the elements long enough. And in only a few years. The only problem I see with some plastics is the "outgassing" that happens with new stuff, it can cause breathing problems for some folks if it occurs in enclosed places.