97 karma · joined August 15, 2022
Here's the vid on trompes I always see come up: https://youtu.be/50fJ8Av_g7Q
I know "free energy" devices don't really exist, but a trompe seems pretty darn close, IMO.
There have been a lot of improvements in RMH design in recent years, led largely by the RMH enthusiasts at https://permies.com/f/260/rocket-mass-heaters
IMO traditional metal wood stoves really suck compared RMHs, but they can be made better by routing the exhaust through a stratification chamber (eg a large metal container like a barrel or a old water tank; hot flue gas enters the top, cooler flue gas exits the bottom). Pretty easy to set up next to an existing wood stove, and you get a lot more heat and a lot less smoke out of an otherwise crappy stove.
Quick, somebody call Deleuze and Guattari! /s https://en.wikipedia.org/wiki/Schizoanalysis
The permaculture folks have been implementing functional solutions to drought for 3 or 4 decades now, repairing large-scale damaged ecosystems and halting desertification. The problem already has a simple effective remedy, and gene-edited crops are a band-aid non-solution that does nothing to change the underlying conditions by which drought is created and perpetuated.
It is widely understood that forests attract/create rainfall (https://academic.oup.com/bioscience/article/59/4/341/346941). Large scale water harvesting earthworks attract/create forests by creating the hydrological conditions amenable to increased vegetative cover. To put it simply, here is what is do be done: an army of people use whatever earth moving equipment they have available (from shovels to machinery) to dig a network of swales and catchments across the landscape, and then plant them with early successional "pioneer" species (sun/drought tolerant, often nitrogen fixing woody shrubs). In 5 to 10 years, the soil will be holding onto to the rain for much longer periods of time , creating the conditions such that longterm forest trees will begin to establish (attracting more rain), and staple crops can be reliably grown. This a proven method, it absolutely works, and it needs to be widely implemented across the globe.
Hopefully this comment get read by the heads of public works agencies of numerous governments in drought affected regions around the world.
Soil and decomposing organic matter aren't necessarily oxygen poor environments, and in ideal conditions they aren't at all. Depending on factors like soil porosity, and rate/frequency of precipitation, there can actually be quite a lot of gas mechanically exchanged between the soil and the atmosphere (water fills up soil pore spaces and pushes out air, then water drains out of soil pore spaces, pulling air back in). Plant roots can respire atmospheric gases into soil as well. Part of the reason why compacted (ie minimal pore space) soil is harder to grow in than the same soil made friable, is because the lack of porosity causes the soil to go anaerobic, which is inhospitable to a lot of beneficial soil microorganisms.
The emphatic message of the research paper is basically like, "tree growing to sequester carbon is very complicated, there's a lot we don't know, and there are a ton of different outcomes depending on how/where the tree growing is carried out."
One part of the paper I found most interesting was the section on nitrogen fixing microorganisms; they made it seem like the nitrogen fixation occurs via microbes pulling nitrogen from the soil and making it available to the plants. However my understanding is that those nitrogen fixing microbes pull N from the air, not the soil. Even good ol' wikipedia says "The bacteria are filamentous and convert atmospheric nitrogen into ammonia via the enzyme nitrogenase, a process known as nitrogen fixation." (https://en.wikipedia.org/wiki/Frankia) ... Undoubtedly there are microbes that can mine nitrogen from the soil, but why focus on those when the real bang-for-your-buck nitrogen fixation occurs when pulling nitrogen from the atmosphere.
Anyhow, great research paper, crappy summary.
Going forward, anytime there is discussion of energy or efficiency of plant vs animal agriculture vs fake meat, etc, if tree crops aren't factored into the discussion then that provides an opportunity to quote No Country for Old Men: "You don't know what you're talking about, do you?" Leaving out that there is the option of growing a tree that produces a cow's weight worth of fats and proteins every year, with little to no inputs, in perpetuity, is a crime of omission.
Just to compare some approximate numbers, 100g of hazelnut contains 17.0g of carbs, 13.7g protein, and 60.8g fat. Walnuts contain 9.9g, 26.1g, and 65.2g, respectively. Whereas 100g of beef contains 0g carbs, 35g protein, and 10g fat. And 100 grams of black beans contains 25g carbs, 9g protein, 0.5g fat.
Further reading -- Tree Crops: A Permanent Agriculture, by J. Russell Smith
Further viewing -- "Nuts as Staple Foods" a presentation by Osker Brown: https://youtu.be/CJpitVC4mzs
Informally yes, but the scientific way is to use a ring infiltrometer: https://www.fao.org/3/s8684e/s8684e0a.htm -- Basically instead of digging a hole, you pound a pipe into the ground and then fill the pipe with water.
As for agricultural practices being able to change soil composition multiple feet down, trees and tap-rooted plants are very effective at placing large volumes of organic matter at depth. One example, Lacy Phacelia (Phacelia tanacetifolia) is an annual plant that produces a dense fibrous root system that reaches a depth of 4 feet; in the fall the Phacelia plants die, and their roots decompose at depth, creating pathways for water infiltration while also increasing soil organic matter at depth. The same goes with other trees and shrubs. The farmer from the "It ain't much but it's honest work" meme, Dave Brandt, has some really enjoyable presentations on youtube about improving soil composition at depth.
In terms of projects whose primary aim is flood prevention / aquifer recharge, John D. Liu, Andrew Millison, and Geoff Lawton all have documented quite a few projects that have been very successful in addressing the problem.
A good example of a similar project in India, as covered by Andrew Millison: https://youtu.be/jDMnbeW3F8A
Sepp Holzer did a similar project in Portugal: https://www.youtube.com/watch?v=OUryneCjxV4 ...I believe he also did some pretty large projects in the middle east, but I can't find any vids on them at the moment.
Geoff Lawton has done a ton of projects like this, but maybe not at the landscape wide scales like the projects above.
Probably the best book on the basic principles of how to do it - Rainwater Harvesting for Drylands and Beyond by Brad Lancaster. Also the book Water For Every Farm by P.A. Yeomans is pretty good as well, but not as accessible of a read.
TLDR - To keep desert monsoons from flooding areas downstream, dig a landscape wide network of swales and basins to catch, soak and sink the water into the soil. Properly dug, such earthworks recharge aquifers while stopping flooding and erosion.
tldr - megaflood can be prevented by building earthen berms throughout the landscape to catch, spread, and sink rainwater runoff into the ground, thereby recharging aquifers and preventing catastrophic flooding.