The book that this talk promotes is actually pretty garbage though. It's short on on citations and reliable figures. It uses a lot of Statfor internal data, that I don't think has been reasonably vetted. It makes a good read while drunk though.
That being said, kudos to Zeihan for being one of the few people who actually gets the big picture vis-à-vis coming american strategic independence and the russian crisis. The problem with his predictions is that you can't expect people to always be rational actors though. Emotions get in the way, and sometimes people do stupid things.
Well, I've got some articles that might make you feel better:
https://newrepublic.com/article/117226/world-war-i-anniversary-world-safer-today-100-years-ago
https://theworld.org/stories/2014-10-23/world-actually-safer-ever-and-heres-data-prove
https://www.vox.com/2015/1/14/7546165/world-getting-safer
My book recommendations go a lot into how free trade has improved the third world—but they may bum you back out, because the author thinks things are about to devolve. Those predictions are controversial, but his description of the current state of things is fairly accurate, I think.
You'll get more out of his most recent book if you read his first, but you can skip his second, so I haven't linked it. He has a fourth coming out in a couple months.
Not sure an article can do the topic justice but the original analysis predicting this is in this book. That prediction subsequently came to pass and there's a series of articles on that here, and there's a more fleshed out book on likely outcomes here. Or if you prefer, there's a video presentation but it's slightly out of date relative to my claim above, but it's still a good overview.