Watching leaves turn color and drop dead — “Fall, leaves, fall; die, flowers, away” (Emily Bronte) — may be one of the few activities this autumn you can do safely, without too many caveats. Maybe don’t get into a bus full of leaf peepers this year. Maybe don’t call yourself a leaf peeper to begin with. Look, just stay in your car, OK? Roll down the window and peep, then roll up the window. Peep with familial peepers. Maybe don’t stay overnight, all right? Do I sound stressed? I am stressed. Here’s the thing: So are trees.