I found the analogy the author drew between us and the denizens of easter island chilling.
Later I was driving away from playing games from my carnivore friends and was feeling depressed at my sense of utter powerlessness at trying to avert our species collision course with catastrophe.
Though this did spark a realization about why I'm so obsessive-compulsive about veganism. Since I feel like humanity is largely doomed without significant change in our use of the ecosystem and I feel powerless to do anything, it would make sense for me to obsessively grasp at anything that has a chance of making a difference.
Given problems like over-population, aquifer depletion, fresh water pollution, desertification, soil depletion/erosion, and dwindling energy reserves I keep feeling like life as we americans currently know it could disintegrate in as little as a couple of years from now.
Of course most people just think I'm crazy. (Though I do feel like I'm better informed about various environmental indicators than most.)