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Carbon Capture...
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this post was submitted on 10 Dec 2023
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Okay? And how are we supposed to deal with the emissions currently in the atmosphere? Even if we abandon all technologies that generate greenhouse gases overnight, we still have shit in the atmosphere warming the planet.
The most compelling strategy I've heard is biochar. You immolate organic matter in a medium like nitrogen so you don't get carbon dioxide, and then you bury the char or use it as fertilizer. The char is relatively stable so shouldn't create much in the way of carbon dioxide once it's formed, and because you make it in an oxygen-less atmosphere you don't get more greenhouse gases from making it.
That's the thing though, fossil fuel companies aren't promoting it as harm reduction, they're promoting it as a solution to emissions so they can keep fucking the earth for profit.
There exists a natural carbon capture cycle that will take up a lot of the existing carbon in the atmosphere. If we reduce production, it will reduce the amount of carbon capture required.
Absolutely, I also think Biochar is very promising as one way to recapture atmospheric CO2 and to compensate further emissions.
While I understood the production process to be a little different, the benefits of Biochar can't be ignored.
The process may be a bit more complex than I understood, but my understanding is that the gist of it is to "burn" plant stuff in a way that doesn't create carbon dioxide or other greenhouse gases. One way of doing that is to use a chamber flooded with nitrogen or similar inert gas. No oxygen means carbon can't bind to two oxygen atoms to create carbon dioxide.
I'm confused, how can you 'burn' anything without oxygen? Burn literally means to oxidize
That's why it's in quotes. You're subjecting it to high heat, which would normally cause it to burn, but because there's no oxygen it chars instead.
I don't understand. Biomass already isnt CO2. Why do we take an extra step?
Because when biomass rots, it creates CO2. By charring it you're making the carbon more stable and less likely to become CO2 in the future. It also won't rot when charred.
So how do we produce biomass? Plant more trees? Which we already do. Then in how many year we cut it down and biochar it instead of using it reporposing it for something else? I'm kind of failing to see the benefit. Just seems like an alternative that isn't really any better than some of the other good alternatives.
Make algae ponds, harvest the algae, dry it, char it, bury it. Algae sucks up carbon dioxide like crazy, the downside being that it releases the carbon when it starts to rot. By charring and burying it, you're helping to make sure that carbon doesn't re-enter the atmosphere.
Peat, too! It's one of the best carbon sinks we currently have.
Ah. I didn't think of algae. Might be a good reason to harvest all the algae blooms from the fertilizer run off.
biochar is awesome
Forests, algae... There is no need for carbon capture. It doesn't do anything on scale. There is need of transformation co2, which can be done by plants and algae
Humans burnt 100’s of millions of years of plant growth within 100 years. There is no way we can significantly reduce the CO2 in the atmosphere with plants alone in a timeframe that is necessary for humanity to see a difference. There is just not enough land to plant that many trees and plants. We need all the solutions and that includes human tech.
But it is not a solution. Carbon capture is the perfect thermodynamic example of sweeping the dirt under the rug. Best case scenario it would alleviate the problem now to make the problem worse in the mid term. Most realistic scenario it will do nothing at all.
We currently do not have a human tech to support the process. The only thermodynamically meaningful process is transformation of CO2 in safe and useful organic compounds. But all our technology is too expansive, and requires a lot of energy, production of which is currently one of the main responsible for emission of CO2
Think of biochar like humans helping plants keep the carbon out of the atmosphere. Plants are good at capturing carbon, but what happens when they die? Hell, what about all the leaves they shed? When something rots, it releases a mix of CO2 and methane (which decomposes into CO2). The idea of biochar is that it's a way of sequestering the carbon that plants captured. For an example, you make an algae pond, harvest the algae, dry it, char it, bury it. That's carbon that's not going back into the atmosphere anytime soon, whereas if it was left to rot, it'd eventually wind back up in the atmosphere. You're taking the carbon the plants captured, and processing it in a way that makes it easier to sequester.
The problem is purely thermodynamic. Plants transform co2 in useful compounds that do not contribute to greenhouse effect.
Any capture system is a temporary storage of co2 that has anyway to be transformed, because co2 is loosely trapped. Scientifically is literally sweeping dirt under the rug. There is no long term benefit (as at some point in the future you'll have too transform more co2 than what in the atmosphere), it costs a lot, and gives a fake sense of "trying to solve the problem", while it's doing nothing