Upworthy wrote:

Original by the late, great Professor Albert Allen Bartlett, who gave this powerful lecture over 1,700 times during his career. If this one made you think, you can watch the entire series online on Professor Bartlett's website. I hope you have some free time, because that thing is a giant pit of endless knowledge. Once you start, you won't come out until an hour later, when you'll be a full-on neo-Malthusian (you'll even know what that means). Don't say I didn't warn you.

I don't share Upworthy's enthusiasm, perhaps because everything on Upworthy is so hyperbolic.