[Full_Clark]

> The work may be niche, but the impact could be high. About 1 percent of SF6 leaks from electrical equipment. In 2018, that translated to 8,200 tonnes of SF6 emitted globally, accounting for about 1 percent of the global-warming value that year.

This figure is for the electricity sector only, not overall global emissions. Still, considering the sheer volume of CO2 puffing up from power stations, it's impressive that the normal operation of SF6 breakers accounts for an integer percentage of their GHG impact.

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Global emissions were 53 Gt CO2 equivalent in 2023 [0]. 38% of CO2 emissions are attributed to the electricity sector in 2023. [1] This figure seems to be strictly CO2, not including other GHG, and I can't quickly find a sector-by-sector breakdown for that year. Per IPCC reports in 2022, electricity production and heating accounted for 34% of global GHG in 2019 [2], so for back-of-the-envelope math, it's reasonable.

Per the article, the GHG impact of SF6 is 25k CO2, so 8.2k tons SF6 emitted annually is 205 million tons CO2e. This is 0.39% of 53 Gt CO2e (the global value), or nearly exactly 1% of the electricity sector's 38% share.

[0] https://www.statista.com/statistics/1285502/annual-global-gr... [1] https://www.statista.com/statistics/1129656/global-share-of-... [2] https://www.epa.gov/ghgemissions/global-greenhouse-gas-overv...

edit: replaced typos of C02 with correct CO2

[gsf_emergency]

Not just academic: Hitachi have already deployed a different gas (mix) last month

https://www.hitachienergy.com/news-and-events/press-releases...

[kragen]

Thank you for doing these calculations! 0.39% of anthropogenic global warming is surprisingly large, but it doesn't sound like a big impact to me. I mean, it sounds like about the same greenhouse effect impact as the San Bernardino metropolitan area (5 million people) or the Chongqing metropolitan area (12 million people).

Retric: I regret not having responded in time to your comments, which I agree with.

[Full_Clark]

In terms of impact, it doesn't sound major, I agree. But it's still work that will need to be done. As industry and transport become more electrified, and electric generation gets decarbonized, impacts like high-multiple GHG gases will become a bigger and bigger share of CO2e still happening.

Atmospheric CO2 is already too high to avert terrible long-term impacts of global climate change. Unless we manage to make massive cost reductions for atmospheric CO2 sequestration, weaning entirely off of fossil fuels will not be sufficient to avoid climate change impacts if we still add long-lived GHG molecules to the atmosphere. (SF6 has an atmospheric lifetime on the order of 1000s of years.)

Think of it like the tide going out in a rocky bay. As the water level recedes, rock pillars that used to be too deep underwater to worry about now are close enough to the surface to cause you trouble. On the other side of the same coin, putting in the work to clear them helps give you as big a space to operate in as you had before.

[burnished]

But large enough that if you did similar 100 times you'd almost halve it!