Here we have a living and a dead tree side-by-side. Click to enlarge.
Notice that, in the dead tree, there is an industrial grade cable strung on some kind of pulley. I've contacted many of the local utilities, and the city, but I was told repeatedly it's someone else's responsibility. Click to enlarge.
Let's have a closer look at that. It's an industrial sized pulley, exerting a lot of tension on that wire, attached by a piece of fucking rope to a dead branch of a dead tree. Click to enlarge.
And in case you thought that the wire was just hanging straight downward, no sir. That's some serious sideways-tension. Click to enlarge:
UPDATE: Here is where the cable eventually connects to a pole. It goes through two more pulleys attached to trees.
UPDATE 2: Here's a map of the whole situation.