In my " Net Assessment of the World ," I argued that four major segments of the European and Asian landmass were in crisis: Europe, Russia, the Middle East (from the Levant to Iran) and China. Each crisis was different; each was at a different stage of development. Collectively the crises threatened to destabilize the Eurasian landmass, the Eastern Hemisphere, and potentially generate a global crisis. They do not have to merge into a single crisis to be dangerous. Four simultaneous crises in the center of humanity's geopolitical gravity would be destabilizing by itself. However, if they began to merge and interact, the risks would multiply. Containing each crisis by itself would be a daunting task. Managing crises that were interlocked would press the limits of manageability and even push beyond. These four crises are already interacting to some extent .