3 ms·

Other than DAC, how do we remove CO2?

_aavaa_ 3y ago
We can deal with that problem when it's the pressing one. These two projects are set to remove 2 MTonnes of CO2 per year (max is they work correctly). The USA alone currently produces ~2,000 MTonnes of CO2/year simply for energy generation [0]. If these two projects are powered by fossil fuel electricity I'll refer you to figure [1]. Best case, they run on CO2-free electricity (Nuclear, solar, wind, hydro). If they are using green electricty, they're better of transitioning their grid off of coal and gas. DAC uses something like 5.5 GJ/t-CO2 [2]. Which, for the 2 MTonnes for these projects it comes out to 2.97 TWh of electricty. On the US grid (7.09*10^-4 t/kWh) those 2 MTonnes of CO2 come out to ~2.8 TWh. So the projects are within a margin of error in terms of reducing more CO2 by existing rather than putting that exact same money into simply creating more green electricity. So I'll reiterate, the discussion about what to do about the CO2 in the atmosphere is a stalling tactic. Instead of wasting time and money to remove 2 MTonnes by DAC, you can avoid all that complication and simply remove it at the source. The time to discuss how to deal with the hard problem of removing CO2 out of the atmosphere is after we deal with the easy problem of not burning shit in the first place. [0]: https://www.epa.gov/ghgemissions/inventory-us-greenhouse-gas-emissions-and-sinks https://www.epa.gov/ghgemissions/inventory-us-greenhouse-gas... [1]: https://media.licdn.com/dms/image/D5612AQHynjdkUha9PA/article-inline_image-shrink_1500_2232/0/1665183819698?e=1697673600&v=beta&t=xE2M3Ersf-bURo2FK9lqqFhwRzKQ60s7GSLLEt7c8Rk https://media.licdn.com/dms/image/D5612AQHynjdkUha9PA/articl... [2]: https://www.sciencedirect.com/science/article/pii/S2589004222002607 https://www.sciencedirect.com/science/article/pii/S258900422... [3]: https://www.epa.gov/energy/greenhouse-gases-equivalencies-calculator-calculations-and-references https://www.epa.gov/energy/greenhouse-gases-equivalencies-ca...
- sillywalk 3y ago
  > We can deal with that problem when it's the pressing one. If is pressing. Any survivable scenario requires the deployment of massive amounts of DAC. That is what net-neutral is. Planting trees wont help, and even if we stopped all emissions today, we still need to remove tens of billions of tonnes of CO2 from the atmosphere.
  - _aavaa_ 3y ago
    But it does not require us to do it now. And we won’t stop emission today or even by 2070 at this rate. Again these units will barely suck out more CO2 than the electricity that powers them (in the best case) would displace. And if you really wish to build them now, they should be build at the expense of the fossil fuel companies, who have known for decades that they were pollution and actively hide the fact and worked to discredit those who wanted them to stop.
    - sillywalk 3y ago
      I don't understand your argument, or what your proposal/alternative is. When you say we don't need to remove CO2 now, then when? How do we get from >400ppm to say 350ppm? Even if we shut off all emissions immediately?
      - _aavaa_ 3y ago
        My argument is fairly simple. The easiest way to get CO2 out of the atmosphere is to not put it there in the first place. We should be all of this money (and much more) to transition off of fossil fuels as quickly as possible. The sooner we electrify everything and get rid of fossil fuels the sooner we can start putting a dent int to 30+ GTonnes/year of CO2 we produce. This ship is quickly taking on water; we can focus on dumping the excess water out after we patched the hull. FYI, One of the projects being funded here is going to be co-run by Carbon Engineering, whose DAC design uses both renewables as well as natural gas to produce the electricity it needs for the process.
        sillywalk 3y ago
        > My argument is fairly simple. The easiest way to get CO2 out of the atmosphere is to not put it there in the first place.>We should be all of this money (and much more) to transition off of fossil fuels as quickly as possible. The sooner we electrify everything and get rid of fossil fuels the sooner we can start putting a dent int to 30+ GTonnes/year of CO2 we produce. Again. Even if we stop ALL EMISSIONS NOW, and blow up every fossil fuel facility on the globe, we need use DAC to remove accumulated CO2.

We can deal with that problem when it's the pressing one. These two projects are set to remove 2 MTonnes of CO2 per year (max is they work correctly). The USA alone currently produces ~2,000 MTonnes of CO2/year simply for energy generation [0]. If these two projects are powered by fossil fuel electricity I'll refer you to figure [1]. Best case, they run on CO2-free electricity (Nuclear, solar, wind, hydro). If they are using green electricty, they're better of transitioning their grid off of coal and gas. DAC uses something like 5.5 GJ/t-CO2 [2]. Which, for the 2 MTonnes for these projects it comes out to 2.97 TWh of electricty. On the US grid (7.09*10^-4 t/kWh) those 2 MTonnes of CO2 come out to ~2.8 TWh. So the projects are within a margin of error in terms of reducing more CO2 by existing rather than putting that exact same money into simply creating more green electricity. So I'll reiterate, the discussion about what to do about the CO2 in the atmosphere is a stalling tactic. Instead of wasting time and money to remove 2 MTonnes by DAC, you can avoid all that complication and simply remove it at the source. The time to discuss how to deal with the hard problem of removing CO2 out of the atmosphere is after we deal with the easy problem of not burning shit in the first place. [0]: https://www.epa.gov/ghgemissions/inventory-us-greenhouse-gas-emissions-and-sinks https://www.epa.gov/ghgemissions/inventory-us-greenhouse-gas... [1]: https://media.licdn.com/dms/image/D5612AQHynjdkUha9PA/article-inline_image-shrink_1500_2232/0/1665183819698?e=1697673600&v=beta&t=xE2M3Ersf-bURo2FK9lqqFhwRzKQ60s7GSLLEt7c8Rk https://media.licdn.com/dms/image/D5612AQHynjdkUha9PA/articl... [2]: https://www.sciencedirect.com/science/article/pii/S2589004222002607 https://www.sciencedirect.com/science/article/pii/S258900422... [3]: https://www.epa.gov/energy/greenhouse-gases-equivalencies-calculator-calculations-and-references https://www.epa.gov/energy/greenhouse-gases-equivalencies-ca...

sillywalk 3y ago
> We can deal with that problem when it's the pressing one. If is pressing. Any survivable scenario requires the deployment of massive amounts of DAC. That is what net-neutral is. Planting trees wont help, and even if we stopped all emissions today, we still need to remove tens of billions of tonnes of CO2 from the atmosphere.
- _aavaa_ 3y ago
  But it does not require us to do it now. And we won’t stop emission today or even by 2070 at this rate. Again these units will barely suck out more CO2 than the electricity that powers them (in the best case) would displace. And if you really wish to build them now, they should be build at the expense of the fossil fuel companies, who have known for decades that they were pollution and actively hide the fact and worked to discredit those who wanted them to stop.
  - sillywalk 3y ago
    I don't understand your argument, or what your proposal/alternative is. When you say we don't need to remove CO2 now, then when? How do we get from >400ppm to say 350ppm? Even if we shut off all emissions immediately?
    - _aavaa_ 3y ago
      My argument is fairly simple. The easiest way to get CO2 out of the atmosphere is to not put it there in the first place. We should be all of this money (and much more) to transition off of fossil fuels as quickly as possible. The sooner we electrify everything and get rid of fossil fuels the sooner we can start putting a dent int to 30+ GTonnes/year of CO2 we produce. This ship is quickly taking on water; we can focus on dumping the excess water out after we patched the hull. FYI, One of the projects being funded here is going to be co-run by Carbon Engineering, whose DAC design uses both renewables as well as natural gas to produce the electricity it needs for the process.
      - sillywalk 3y ago
        > My argument is fairly simple. The easiest way to get CO2 out of the atmosphere is to not put it there in the first place.>We should be all of this money (and much more) to transition off of fossil fuels as quickly as possible. The sooner we electrify everything and get rid of fossil fuels the sooner we can start putting a dent int to 30+ GTonnes/year of CO2 we produce. Again. Even if we stop ALL EMISSIONS NOW, and blow up every fossil fuel facility on the globe, we need use DAC to remove accumulated CO2.