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Cedric Knight 🌍

@cedric.greennet.social

376 followers 742 following 163 posts

Inside every cynic is an idealist struggling to get out. I can't access DMs, won't AV. Pedant. Tech @greennet.org.uk. Here to amplify science and join dots. #KeepItInTheGround #EndFossilFuels 💙💚 🐘 @cedric@greennet.social 🐦was Cedders68

Posts Replies Media

Cedric Knight 🌍 @cedric.greennet.social · 10/05/2026

This was the post. I don't know the poster, but it seemed relevant to the most likely technology for green steel.

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Cedric Knight 🌍 @cedric.greennet.social · 01/05/2026

Might be possible to avoid H₂ in steel using metal oxide electrolysis?

Hydrogen ladder version 5. From A-G, electricity is better from D-G.

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Cedric Knight 🌍 @cedric.greennet.social · 09/11/2025

My point is that latent environmental damage (particularly ocean carbon disruption over centuries) *could* end the Cenozoic and sufficient food web productivity and atmosphere to support large mammals. Most climate scientists say human extinction very unlikely from fossil fuels. I'm not so sure.

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Cedric Knight 🌍 @cedric.greennet.social · 08/11/2025

The work of Rothman and associates is so important. There is negative feedback (silicate weathering) at timecales >100,000 years, but positive feedbacks on century/millennia timescales, suggesting potential for a future Canfield ocean. #rothmancarbonthreshold Pasting pic as reminder of fluxes.

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Cedric Knight 🌍 @cedric.greennet.social · 08/11/2025

Sorry if you've seen this diagram before, but I use it to argue that biogenic CO₂ and methane is irrelevant on century and longer timescale. We ignore oceans and the #slowcarboncycle at future civilisations' peril. I have contingent confidence in H sapiens's ability to adapt. #carboncycle 2/2

My diagram of four carbon cycles: 400 GtCO₂/year from photosynthesis, 7 to animals, 200 in ocean gas exchange, and very slow natural rates about 0.5 from weathering and carbonate depostion. The slow carbon cycle is massively perturned by 35 GtCO₂/year from coal, oil and gas.

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Cedric Knight 🌍 @cedric.greennet.social · 08/11/2025

Thanks for links. Hadn't heard of 2030s 'moon wobble'. I'd seen Maslin on CO2 from European invasion. That and Mongol invasion may be detectable on proxy records, but are tiny compared to industrial perturbation. Plus... 1/2. Things looking bad but uncertain IMHO. I'm still with decarb groups.

CO2 proxies over common era (past 2025 years) from Keeling Curve website. Noticeable dip around 1600.

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Cedric Knight 🌍 @cedric.greennet.social · 04/11/2025

"Innovation"/R&D was big oil's delay tactic since 80s and Gates knows too little to defend against it. A 'tech visionary' when we need cuts now. Climate workers do worry most about intl inequities of eg env disasters. IMHO we also do want attention on less certain (LPHI) risks and #tippingpoints.

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Cedric Knight 🌍 @cedric.greennet.social · 20/06/2025

Stole it. This evening at DESNZ with @fossilfreeldn.bsky.social

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Cedric Knight 🌍 @cedric.greennet.social · 20/06/2025

⚠️ Warning. Tipping points ahead. Like the graphic. Would make a good placard.

Triangle warning sign, with long side down, showing crumbling cliff and man pushing globe, with continents visible, over the edge.

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Cedric Knight 🌍 @cedric.greennet.social · 05/05/2025

I don't know source of that particular graph, but the uncertainties look similar to IPCC AR6. Radiative forcing (left) is relatively certain, but temperature response including cloud feedback, and how much aerosols have masked, is related to climate sensitivity.

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Cedric Knight 🌍 @cedric.greennet.social · 24/03/2025

Will you be posting a more detailed itinerary for #WelfareNotWarfare on Wednesday? Thanks.

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