Tomorrow starts a quarter of PBL

I am a bit nervous about starting the PBL unit tomorrow, mostly because it is an unknown in my teaching. But that's exciting too. For years I've done the "can humans live in the sea?" PBL every winter, but it was only about three weeks long. Now I face a whole quarter and an entirely new product: a presentation to city or county government. At least that's what I envision for the endpoint, but I think the students will surprise me with creative ideas. I've got a decent list of learning targets (here), and a core theme that I don't think can fail with my students: Is Missoula prepared for a local or regional disaster? They're all fascinated by "the end of the world in 2012," but will they take the bait and run?