so you use a relatively rare material to create hydrogen. Quite an advance over using another material that's said to be becoming rare...

Magnesium is by no means rare. It is as common as sodium. Besides, Bumsfeld is talking about recycling it. Actually, there have been quite a few studies done on this, the prospects of using magnesium as a safe hydrogen carrier look very good.

If you have constipation, you could eat some magnesium hydride, this way you would fire on both ends.

Oh, the benefits of cheap electricity!

Nuclear waste is no problem! You ship it off to one of those underdeveloped countries in rusty old ships that sink on the way! You can always call the cargo "recalled toys".