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Safety NETs - The Biochar Way

by Kathleen Draper and Hans-Peter Schmidt

Humanity is in need of a safety net to hold us back from free fall into climate chaos. But what might this net, or more likely nets, look like? The recent IPCC report may provide some clues. But it needs now the biochar world to partner with media producers to get the facts and stories on the big screen and make people talk about biochar in the streets.

The IPCC’s recent Special Report state’s that while steep and rapid emission reductions are critical, we have come to a point where carbon must be pro-actively pulled out of the air and stored safely elsewhere. Storage options are limited to land or oceans (though no doubt some would like a moonshot!). Land-based storage options include soils, deep geological storage or rocks – yes rocks!

The report lists a mere six Negative Emissions Technologies (NET) that they feel may be capable of drawing down massive amounts of carbon. Biochar, for the first time is included in that shortlist. To recap the sequestration mechanism offered by biochar: carbonizing underutilized organic material, be it sewage sludge, city green waste, storm debris, invasive species, food waste or myriad other sources, converts recently photosynthesized atmospheric carbon into stable, long-lasting carbon that can be stored in soils or safely incorporated into man-made materials.

Biochar, along with only two other NETs, afforestation/reforestation and soil carbon sequestration are ancient, proven processes which provide many other benefits beyond sequestration. The other three NETs; Bioenergy with Carbon Capture & Storage (BECCS), Direct Air Capture with Carbon Storage (DACCS), and Enhanced Weathering, have yet to be proven scalable, and may come with unintended consequences and enormous cost.


Figure 1: The six Negative Emission Technologies (NET) discussed in the latest IPCC special report.

A limiting factor for most of the proposed NETs is land. There is only so much bare land that can effectively be converted to forests, agricultural land that can store carbon without endangering food production or biodiversity, or remote lands that can safely store carbon captured from bioenergy production smoke stakes or pulled from thin air.

While the IPCC’s report lists soil (presumably agricultural) as biochar’s storage medium, this is not entirely accurate. Much of the earlier biochar research focused on agricultural uses in soils, but increasingly it is being shown that biochar can be put to good use in urban soils for storm water management or in contaminated soils (e.g. mine lands, brown fields, landfills etc.) thereby expanding the amount of land where biochar can be sequestered. Also, it is important to note, that biochar is increasingly being eyed as a material to put into various man-made materials as a means of displacing non-renewable, expensive or high carbon footprint materials. These products have productive lives above the soil before finding their way eventually into the soil. This includes many shorter-lived products such as kitty litter, bio-plastics or filtration carbon which may end up in landfills where it still sequesters carbon and may even reduce methane emissions. Longer-lived biochar-based products are gaining attention in the form of building materials which not only serve as carbon sinks but can provide insulation for housing and other environmental benefits.

Moreover, bio-oil, a liquid by-product of biochar production can equally be used to replace fossil fuel-based materials like plastics, composite materials or asphalt. The smart use of bio-oil can further increase the carbon sequestration potential of the biochar technology by more than 50%. This makes the biochar method (or pyrolytic carbon capture and storage (PyCCS) as it is also called) the by far most efficient and cost-efficient NET.



Figure 2: General PyCCS scheme for pyrolytical treatment of biomass, the pathways of solid, liquid, and gaseous products, their use and sequestration scenarios, the respective C-leakage rates, and the circular effect on carbon farming systems and sustainable biomass production.   

One other thing to note with biochar is that it can increase the sequestration potential of both afforestation/reforestation and soil carbon sequestration. When used to plant trees, biochar can not only speed up growth, but it has been shown to provide increased resistance against disease pressure, so trees may live longer. While developing healthy forests, an abundance of residual forest biomass is produced which could provide the fodder for biochar which can then be put back into forest soils helping to further boost soil fertility and water management while sequestering more carbon.

Soil carbon sequestration includes changing destructive agricultural practices such as monoculture cropping and optimizing nutrient cycling to increase soil organic matter build-up. Combining biochar with other organic (nutrient rich) materials (e.g. manure, digestate, compost, etc.) can not only provide longer-term carbon sequestration, it can help hold onto nutrients longer which reduces other negative environmental impacts such as groundwater contamination, eutrophication and greenhouse gas emissions.

So as the need for carbon safety nets grows and our window of opportunity shrinks, let’s make sure we chose NETs that are in fact safe, sustainable and offer a high possibility of success. For a more in depth perspective of this topic, please have a read of this article on the Biochar Journal.

Representatives from the International Biochar Initiative (IBI) and the Ithaka Institute attended the recent United Nations Climate Change Conference (COP 24) in Poland. Despite the inclusion of biochar into the latest IPCC special report, we well knew that biochar’s capabilities to help communities adapt to climate change, reduce emissions and sequester carbon were not yet well known. However, it was shocking to see how ignorant the elite of climate change science and policy still is in regards to biochar. This is especially true for the entire aspect of biochar’s versatility in terms of the 55 uses of biochar to help individuals or industries, in both the developed and developing world, to reduce or eliminate greenhouse gas emissions and to eventually become carbon negative (= climate positive).

Following the world climate conference, we are thinking and discussing what will it take to quickly bring biochar and the other co-benefits from pyrolysis to the world’s attention? We really need to tell the world about the existing and emerging biochar stories of individuals and industries, of co-ops, communities and even countries that are leveraging biochar to cut carbon emissions while continuing to grow food and economies. There are an increasing number of successful biochar stories that need to get to and covered by the big media. We can deliver the facts and stories but we need to partner with media producers to get the facts and stories on the big screens and to make people in the streets talk about it. That’s our mission at IBI and at Ithaka.


  • Thomas Vanacore,
    31.12.2018 17:34

    Combining three of the best carbon capture technologies in one practice

    We suggest that combining biochar with enhanced weathering in a land management strategy broadly titled "improved agricultural practices" or "regenerative land management", or "agro-forestry", or "land based climate mitigation" or some other moniker suitable to the geographic region and the practice, we can rapidly deploy at scale through "conventional" transport, materials handling and deployment methods. Rock Dust Local has been advocating for this approach for many years through remineralization, only in the last 10 years have we been aware of the extraordinary potential of including biochar production and deployment as a core technology and practice. See Regenerative farming and agro-forestry are suitable settings for these inputs and can increase the carbon holding capacities of soils through interaction with biology; bacteria and fungi. The potential downsides are overstated while the potential benefits are under-reported. We know this works because we are deploying the materials at scale and measuring the results. If the IPCC believes its own rhetoric these technologies and practices should be immediately deployed, and ramped up at global scale, without fail. By doing so we will gain much more than we will lose in both CO2 and CO2e (N2O, CH4, etc.) capture, as well as knowledge. Farmers and foresters practicing biologic methods are astute at figuring out what works and what does not. We can do this! Thomas Vanacore/ CEO Rock Dust Local/ Bridport VT USA

  • Hans-Peter,
    31.12.2018 17:48

    Rock Dust + Biochar

    Many thanks, @Thomas Vanacore, for this timely and excellent comment. We completely agree that the combination enhanced weathering, biochar and increased biomass production (within agriculture) is the way to go. All three methods alone though best in combination are ready to scale-up. They are not only good for the climate but equally for all sort of ecosystem service. The only problem is there are many, many people who would gain from doing it but not the few super rich that have the power to make policy servile. There are lots of synergies to be expected combining rook dust and biochar, let's work on that!

  • mike flynn,
    31.12.2018 19:33

    Rock Dusts + Biochar

    Rock Dusts + Biochar do make for a synergistic combination but this pairing is made way more powerful when they are first, fed within a vermicomposting process and then second, blended with the enhanced vermicompost to make a solid amendment.

  • Norman T. Baker, PhD,
    01.01.2019 19:41

    Additional Considerations

    (a comment in regard to Fuss et al. (

    At first, I was very pleased to see biochar entering mainstream academic thinking on economics. When I read the paper carefully, I was very surprised there was no one on the team who was actually involved with biochar. Any of the references cited should have directed them immediately to someone like S. Joseph, J Lehmann, HP Schmidt, P.Taylor, or The Biochar Journal. They were, IMHO, entirely too quick to get into print. Technical readiness for making biochar is somewhat limited currently. But anyone involved firsthand with biochar kilns (retorts, flame-caps and TLUDs) know we are at the cusp of creating biochar kilns that will have truly clean emissions and be available for democratized applications. These new kilns will be a grass-roots movement for individuals to make their own biochar. It will be personally rewarding for everyone to make a move to sustainability. And many will find additional uses beyond soil application.

    Right now, I know of no one who is able to keep current on the number of uses for biochar. Seems to increase almost daily. Last week my local big box store started selling charcoal toothpaste - about time. One more point that could be made is that of all the NETs discussed, biochar is the most sustainable in nearly every application discussed by Fuss el al. This simple observation applies in every use and application I have seen for biochar and simultaneously solves so many problems.

    One significant consideration missed by the Fuss team is using mankind's municipal waste stream as a source of feedstock for making charcoal and biochar. This would solve several problems for a modern economy simultaneously and synergistically. A few modern recycling efforts where "everything goes into the dumpster" and the municipality sorts and recycles appropriately have shown recycling rates as high as 80%. The energy could be harvested, the carbon sequestered, waste could be managed appropriately and global warming turned into global cooling - or at least make a good start. Recycling could be jump-started into a whole new paradigm for everyone simply because as public awareness grows and people start applying simple cultural changes, the grass-roots movement to carbon sequestration will grow. And, I suspect it will happen without the apocalyptic life-style degradation we all fear for the future and see in the cheap sci-fi movies. As a die-hard environmentalist, biochar is the most exciting phenomenon to happen in our lifetime.

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