Photo by NASA The Blue Marble is a famous photograph of Earth taken on December 7, 1972, by the crew of the Apollo 17 spacecraft en route to the Moon at a distance of about 29,000 kilometres. It shows Africa, Antarctica, and the Arabian Peninsula.

Carbon dioxide (CO2) comes up a lot these days, in politics, in media, and increasingly in daily life, a trend I hope continues as the urgency of global warming overwhelms our inaction, but just how we perceive this CO2 and its climatic counterweight, oxygen, is very nuanced, and very important. CO2 is not merely a…

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Zack Metcalfe