Can you please check my summary?

Thank you =] Please tell me if there are grammatical errors or things like awkward sentence structures and unclear word choices.

In his article “The Doomsday Machines”, journalist John Markoff outlines the threats that some “serious scientists and researchers” believe new technologies pose to the future of humankind. The root of all those threats lies in technological self-replication. Markoff classifies the threats into three broad areas of technology: robotics, nanotechnology, and genetic engineering. He notes that even more threats, which are stranger and cannot be classified within those three areas, exist. Within the field of robotics, one threat is the evolution of existing highly-intelligent self-programming robots into beings capable of participating in natural selection and competing with humans for resources. Some scientists even believe that artificial intelligence will suddenly “awaken” on a single unknown date in the very near future. The internet also poses a threat, argue other scientists, for it could develop an independent chaotic intelligence if it attains a certain number of interconnections. Within the field of nanotechnology, the chief threat is the independent reproduction and spread of destructive micro-assemblers such as omnivorous bacteria. The development of biogenetic weapons, such as diseases targeted at particular social groups for political ends, is the primary threat from the field of genetic engineering. In the conclusion of his article, Markoff nevertheless states that all those predictions for technology-driven apocalypses could possibly be wrong, for humans have been able to survive many other apocalyptic warnings throughout history.