The Ledger
Every statement that passed quotation and attribution checks. Mix any filter with any other: certainty 1/5, debate potential 5/5, or both at once.
why aren't all 10 resolved? a statement only gets an assessment when the public record can support or contradict it. opinions and what-ifs never can, and 0 checkable ones are still open, waiting for their date. predictions held up or didn't; assertions are supported or contradicted. on every card: ▮▮▮▮▮ certainty · ▮▮▮▮▮ debate potential. speakers are clickable
Dreyfus: No existing technology can currently concentrate ultra-dilute atmospheric methane
“We are not currently aware of atmospheric methane concentrators that are able to enhance methane from an ultra dilute to PPM to a higher level of concentration.”
Dreyfus: Natural sources drive 35% of methane emissions with no mitigation tech
“Human sources of methane, there are some that we have mitigation alternatives for, and when we talk about hard-to-abate sectors for carbon dioxide, there are also hard-to-abate sectors for anthropogenic methane sources that we don't have good mitigation option…”
Dreyfus: Megatons of methane removal match gigatons of CO2 removal
“When you introduce that global warming potential, that 80 to 90 times more potent over a twenty-year lifetime, yes, if you're talking about climate impact, the amount of methane that you have to remove for a comparable climate impact to CO₂ When, you know, we'…”
Dreyfus: Maintaining methane's temperature impact requires ongoing tail removal
“Because that methane would have gone away eventually over time, to maintain that temperature impact over time, you actually need to continue to remove the methane, not at the original scale, But there's this concept of effective methane removal, so you have yo…”
Dreyfus: Soil methane interventions risk inadvertently increasing nitrous oxide emissions
“You have to be really careful that you're not going to tip the system to increase, for example, nitrous oxide production.”
Dreyfus: Methane capture works for point sources, not ambient 2 ppm levels
“Some of the technologies that we're going to be talking about may already have lab-based or pre-commercial or even commercial applications at that dairy barn or coal mine shaft, but not yet at the two PPM level.”
Dreyfus: Atmospheric methane is 200 times less concentrated than CO2
“It's about, there's about 200 times less methane by volume than CO₂, and one of the major controls On the efficacy of removal is concentration, so that difference in concentration, for one, is just going to make it that much harder to do the atmospheric methan…”
Dreyfus: Atmospheric methane naturally converts to CO2, which is far less potent
“Almost all of that methane Business as usual would convert to CO₂ anyway. So as soon as you're releasing methane to the atmosphere if it's a fossil source methane, then yes, that CO₂ that is eventually converted to is additional CO₂ that would, that's being ad…”
Dreyfus: Commercial methane reactors currently require at least 1,000 ppm concentrations
“There are commercial and, ah, research reactors that can work down to approximately 1000 parts per million. And so you have thermal oxidizers already in coal mine, Vent air, and you have some research reactors being applied in dairy barns”
Dreyfus: Methane is much harder to separate from air than CO2
“Unlike CO₂, which you, is sticky in the sense that, you know, it's amenable to acid-base chemistry, there are ways that you can grab a hold of a CO₂. Methane doesn't really have that same, the same properties. It is symmetric, It doesn't have acid-base chemist…”