Question

but the true fruition of hawthornes vision may not come until the period from 2020 to 2050, when true artificial intelligent (ai) programs will finally be added to the net, capable of reason, common sense, and speech recognition. some call this the \fourth phase\ of computing, when we will be able to communicate with the internet as if it were an intelligent being. eventually, accessing the internet may resemble talking to the magic mirror of childrens fairy tales. instead of typing arcane codes and symbols into a web identify the existing trend.

Explanation:

The text describes a trend in computing, specifically the development of AI - enabled Internet interaction from 2020 - 2050 (the "fourth phase" of computing) where we can communicate with the Internet as an intelligent being. This relates to the evolution of computer - related technology, so the subfield of Natural Science - Computer Science is appropriate as it deals with the development and trends in computer systems and AI.

Answer:

The existing trend is the evolution of computing into a "fourth phase" (2020 - 2050) where true AI programs will be added to the Net, enabling communication with the Internet as an intelligent being, related to Computer Science (Natural Science subfield).