What bad stuff we're doing

I was skeptical when I saw the headline "What will future generations condemn us for?"in the Sunday Outlook section of the Post. I mean, it's a great topic, but I was skeptical it would get to something we hadn't all thought of.

But while the piece, by Anthony Appiah, ends up with some expected suspects (factory farming, our prison system), what's neat is the way it gets there, laying out a historical pattern for what kinds of things are signs that it's going to be something we'll later see in a bad light.