AUSTIN — A University of Texas professor says the Earth would be better off with 90 percent of the human population dead. “Every one of you who gets to survive has to bury nine,” Though his statements are admittedly bold, he’s not without abundant advocates. But what may set this revered biologist apart from other doomsday soothsayers is this: Humanity’s collapse is a notion he embraces. Indeed, his words deal, very literally, on a life-and-death scale, yet he smiles and jokes candidly throughout the lecture. Disseminating a message many would call morbid, Pianka’s warnings are centered upon awareness rather than...