John Cox

Blogs · @wyome

Tagged public health · everything

AC Feels Great, But It’s Terrible for the Planet. Here’s How to Fix That

Traces air conditioning's history from a business tool for factories and stock exchanges to a symbol of American class and racial status, showing how Freon's ozone-destroying properties nearly caused catastrophe before the Montreal Protocol, and how its replacement, HFCs, became a potent greenhouse gas driving the very heatwaves AC is used to combat. Argues that swapping refrigerants alone won't solve the problem since cooling still demands massive energy and individual AC units worsen urban heat for those without access to them. Concludes that the real fix is cultural and infrastructural—shifting from private comfort toward public cooling solutions like shade, green space, and water infrastructure, since equitable communal cooling is both more effective and less destructive than everyone chasing personal comfort.

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Should you always treat a fever? The symptom that puzzled doctors for millennia

This piece traces fever from a misunderstood ailment—once treated by bloodletting and even mistaken for the disease itself—to its recognition, after germ theory, as a deliberately regulated immune defence that raises core temperature to hamper pathogen replication and boost white blood cell efficiency. It explains the physiology of the hypothalamic "thermostat," why fevers evolved across cold- and warm-blooded animals alike, and why suppressing mild fevers with medication can sometimes backfire, from slower recovery to greater disease transmission when people resume normal activity too soon. It's worth keeping for its nuanced verdict: fever is generally protective and often best left to run its course for 24-48 hours, but becomes dangerous above ~40C or when it masks serious conditions like sepsis or meningitis.

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