Last week, Google labs released a new language tool, the Google Books Ngrams Viewer, that lets you plug in any word or short phrase and see how often they occurred in published books over a designated period of time.
While the technological tool itself is certainly worthy of its own post (looking at you, Peters!), it sure is fun (or, at least, interesting) to see how various words and phrases relevant to a particular field have played out over time.
Nicola already went ahead and tracked America's diet using Ngram. Following her lead, I couldn't help but wonder how various environmental terms have played out in literature over the past 100 or so years.