It was interesting to find that by analyzing trends in published books, we can uncover how certain ideas and technologies gain attention over time. Using Google Ngram data, this post highlights two striking examples: the dramatic rise of sustainability since the 1970s, reflecting growing cultural and environmental awareness, and the more recent emergence of Additive Manufacturing as a specialized industrial innovation, appearing alongside the decline of traditional machining.
Sustainability seems a relatively modern concept in mainstream literature, but once it appears, it becomes a dominant and accelerating theme—likely driven by environmental awareness, policy, and global discourse. While Additive Manufacturing is a young, technical term that hasn’t (yet) entered general discourse at scale.
From this second graph, instead appears that Machining has a long history and peaks around the mid-20th century and decline after 2000. While Additive manufacturing rises exactly when machining declines—but does not replace it in volume. This suggests technological diversification, not substitution. Additive Manufacturing emerges as a complementary or disruptive technology, but traditional machining remains dominant.
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