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In case someone wants to do the math again :

50W for 1 hour : 50Wh or 0.050kWh

California : 187gCO₂eq/kWh according to https://www.electricitymap.org/zone/US-CAL-CISO

-> 9.35gCO₂eq/h -> 0.16g/min -> 0.935g for 6 minutes

I'd probably use closer to 10W as the device power level (a standard laptop, what I'm using right now), so the number for me would get close to 0.2g, but your point stands; the article is answering a different question than I was assuming, but regardless it seems that the majority of the energy is clearly the local device.

Isn't a modern laptop mostly idle after loading the page (< 5 seconds) ?

There would be a peak for the first seconds, then less than 10W for the rest of the reading time ?

Definitely the peak would be higher. My laptop has a ~60Wh battery and gets ~6hours of battery life, so I was just assuming 10W average for web browsing.

Thanks for the figures. I've bought an ARM PC in part for lowering its footprint.

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