What is decadence?

I've talked about decadence many times on the board. What I know about it I learned mostly from Camille Paglia in her book Sexual Personae. But this guy goes into great depth about what it is, the causes, and even what can be done to try to reverse it. Fascinating stuff. He talks really fast—you might want to slow it down a bit, and some of the best info is in the big blocks of text that go by too fast to read unless you pause the video when one pops up.