Scott Adams in the WSJ...

With a very informative (and funny, of course!) piece on green houses.  Here's a teaser:

If your local building code doesn't already require a radiant barrier—a type of insulator for the roof—then look into it. I'm told that should be on the top of your list, at least for warm climates. This would be a good time to point out that nothing you learn about green building materials will be supported by relevant data that is in the proper context for your particular home. But the rest of your life is probably a mess too, so you'll get used to it fast.

But go read the whole thing.