New York Times: When people think of the Mississippi River, they might have visions of Mark Twain and old steamboats. But few Americans understand the vast amounts of shipping traffic that still makes its way up and down the river, part of the worlds largest navigable inland waterway.
As I write in The Times, a Midwestern drought has caused the dwindling of the mighty river in recent months. The phenomenon cannot necessarily be ascribed to climate change no individual weather event can be.
Still, shifting...