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8 SMT007 MAGAZINE I JUNE 2023 Nolan's Notes by Nolan Johnson, I-CONNECT007 Getting Real About Sustainability As we gathered content for this issue of SMT007 Magazine, I kept reflecting on my early 1980s college history class on World War II. I had been surprised to find that my textbook was written by a physicist from the Manhattan Project and concluded with a chapter devoted to a physics thought experiment. e author had done some esti- matory mathematics (as physicists do) to determine that 20th century man was heat- ing up the planet at such a rate that it would become a world crisis. As I recall, he fac- tored in CO 2 emissions and the amount of heat released into the atmosphere per house- hold, coming from even simple activities like cooking and hot showers. It was thought provoking. My point here is not to take a stand on cli- mate change. Rather, it's to note that a phys- icist's musings 40 years ago have generally become mainstream in the sense of over- all sustainability. Of course, responding to climate change is just a small part of what encompasses sustainability. We generally agree nowadays that our world is a closed system containing finite resources. e 19th-