Corporate Climate Solutions

Mash Makes

Summary

Giving Green recommends the Mash Makes Maharashtra Model as one of the top carbon removal opportunities for businesses.
Mash Makes is an Indo-Danish carbon-negative energy company. It aims to convert waste streams (primarily residue biomass) into energy products (biofuel, hydrogen, and electricity), of which biochar is a byproduct.
Mash Makes partners with farmers, NGOs, and organizations working in agriculture in India to convert crop residue that would have otherwise been burnt into biochar, with the possibility of expanding to other locations. Applying biochar to soil securely stores carbon that plants have removed from the atmosphere with medium-term permanence, preventing carbon emissions and air pollution.
We have identified the Mash Makes Maharashtra Model as a high-quality, medium-term-permanence carbon removal option.

Notes

This recommendation was last updated in November 2022. It may no longer be accurate, both with respect to the evidence it presents and our assessment of the evidence. We do not have plans to update this recommendation in the foreseeable future as we have paused our work assessing direct carbon removal and offset projects. Questions and comments are welcome.

Giving Green believes that donating to our top recommendations is likely to be the most impactful giving strategy for supporting climate action. However, we recognize that contributing to policy advocacy (as most of these recommendations do) may not be tenable for all donors, especially businesses. Taking this into consideration, we recommend Mash Makes specifically for businesses given its more direct alignment with corporate net-zero ambitions. We believe Mash Makes to be a high-impact option, but we are unsure of the extent to which its cost-effectiveness approaches that of our top recommendations

Medium permanence. The biochar produced through pyrolysis is more stable than the original feedstock. However, biochar permanence can be highly variable depending upon the feedstock type and pyrolysis temperature, which influence biochar characteristics, and the post-production conditions, which impact how quickly biochar will degrade.

Mash Makes biochar has an oxygen-to-organic carbon ratio of 0.056, a hydrogen-to-organic carbon ratio of 0.4, and pyrolysis production temperatures of 550°C. Mash Makes biochar feedstock is currently primarily agricultural residues such as nutshells, but it may expand to other feedstocks in the future.¹² Due to these characteristics, we estimate the theoretical quality of Mash Makes biochar to be extremely high, with a >1000-year half-life under laboratory conditions.¹³

MASH Makes recommends that its biochar is first mixed with compost, manure or an organic fertilizer before it is applied to the soil. This ensures that the biochar forms a stable sink and no biochar is lost to wind erosion. Research has shown that laboratory estimates are relatively accurate in temperate climates, but there is less confidence in the accuracy of laboratory estimates in tropical or subtropical areas.¹⁴ At the moment, Mash Makes primarily operates in India, which has a tropical semi-arid climate. Differences are likely to be greatest between laboratory estimates and field results where low-quality biochar contains high amounts of unstable carbon, as it is unstable carbon that will be primarily affected by post-production conditions. For example, one study found that only biochar produced at pyrolysis temperatures >550°C could persist for >100 years in high soil temperatures of 40°C - 60°C.¹⁵ Due to this, we think it is unlikely that the >1000-year half-life of Mash Makes biochar will change in field conditions. However, we acknowledge the uncertainty around this estimate and the need for further research. As a result, we categorize the permanence of Mash Makes biochar to be in the 100-1000+ year half-life range. We hope to receive further information from Mash Makes field trials within a year to clarify this further.

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¹² “The state of Maharashtra itself burns about seven million tonnes of crop residue yearly – which is 80% of its total annual crop residue generated. Of this, sugarcane leaves, along with cotton, soy and wheat residue make up the bulk of the burnt stubble.” Mash Makes. n.d.

¹³ See “Permanence” section of Biochar Sector Overview. Giving Green, 2022.

¹⁴ “However, at elevated temperatures (40 or 60 °C), which may be experienced in tropical environments at certain times and especially in surface soil, only the biochars produced at a higher pyrolysis temperature (e.g. 550 °C) may persist for more than 100 years.” Fang et al., 2014; See “Conclusions” section. Kuzyakov, 2014.

¹⁵ “However, at elevated temperatures (40 or 60 °C), which may be experienced in tropical environments at certain times and especially in surface soil, only the biochars produced at a higher pyrolysis temperature (e.g. 550 °C) may persist for more than 100 years.” Fang et al., 2014.

Mash Makes offers two co-benefit streams: those from the avoided burning of crop waste and those from increased food security based on improved soil quality due to biochar addition.

Mash Makes aims to use feedstock that would have otherwise been burnt. Converting this biomass into biochar instead prevents air pollutants from being released. These air pollutants enhance climate warming and are harmful to human health, alongside having subsequent impacts on tourism and the socioeconomic status of farmers.¹⁶ It also contributes to climate warming by releasing black and brown carbon, which absorbs incoming solar radiation as heat and warms the air, changing rain and cloud patterns.¹⁷ We have high certainty that the prevention of feedstock burning positively impacts human health through decreased air pollution, which likely has other flow-on environmental and socioeconomic benefits.¹⁸

The co-benefits from improved soil quality are more difficult to quantify. Field research has shown that in some conditions, biochar can help to remediate soils, improving soil water holding capacity and nutrient availability, decreasing plant susceptibility to disease, and increasing crop yields. Increases in crop yield could benefit the food security of those living in regions with depleting soil quality and a rapidly increasing population. However, the co-benefits depend on several environmental and biochar characteristics.

MASH Makes recommends that its biochar is first mixed with compost, manure or an organic fertilizer before it is applied to the soil to benefit soil health and crop productivity by charging the biochar with nutrients.¹⁹ However, we will have higher certainty of this claim once Mash Makes field trials are complete. Overall, the geographic location of Mash Makes seems suitable for using biochar to improve soil quality and crop yields, as field trials with biochar have shown positive increases related to improved crop productivity in regions with weathered soils.²⁰ However, we are unsure whether optimizing Mash Makes biochar for carbon sequestration will prevent this effect. We will rely on the results from its field trials to be certain about the benefit of its biochar for soil quality. Mash Makes is currently partnering with local universities to undertake field trials on the impact of its biochar on soil quality, which will help us to increase our certainty in this area.

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¹⁶ “These particulate matters pose a higher health risk, monetary losses, and socioeconomic losses.” Singh et al., 2022.

¹⁷ “One contributor to global climate change is the release of fine black and also brown carbon (primary and secondary) that contributes to the change in light absorption.” Bhuvaneshwari et al. 2019.

¹⁸ “The impact of stubble-burning is not limited to human health, soil, and ambient air quality. Stubble-burning has a range of effects on economic growth and causes other social problems such as adverse effects on tourism, agricultural productivity, farmer’s socioeconomic condition, and climate effects”. Singh et al. 2022.

¹⁹ Correspondence with Mash Makes, 2022-11-15.

²⁰ “The greatest (positive) effects with regard to soil analyses were seen in acidic (14%) and neutral pH soils (13%), and in soils with a coarse (10%) or medium texture (13%). This suggests that two of the main mechanisms for yield increase may be a liming effect and an improved water holding capacity of the soil, along with improved crop nutrient availability.” Jeffery et al., 2011.

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Mash Makes

Summary

Notes

Overview of Mash Makes

Mechanism

Causality

Project Additionality

Marginal Additionality

Permanence

Co-Benefits

Cost

Key Uncertainties and Open Questions

Conclusion and How to Contribute

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