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Blog - Our Journey to Negative Emissions

Insights from monitoring leachate alkalinity, pCO₂ and CO₂ efflux of 400 weathering experiments over one year
Insights from monitoring leachate alkalinity, pCO₂ and CO₂ efflux of 400 weathering experiments over one year

We present insights we gained from CO₂ efflux, soil pCO₂ and soil water leachate alkalinity data of 400 greenhouse experiments for enhanced weathering (EW).

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Dirk PaesslerApril 11, 2024
Carbdown Fluxmeter Army: Building Robotic Scientific Instruments For CO₂ Efflux Monitoring Of EW Experiments
Carbdown Fluxmeter Army: Building Robotic Scientific Instruments For CO₂ Efflux Monitoring Of EW Experiments

Why and how we built our army of autonomous CO₂ fluxmeters

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Dirk PaesslerFebruary 8, 2024
Project Carbdown Greenhouse: Experiment Extension Week
Project Carbdown Greenhouse: Experiment Extension Week

Last week we have extended our greenhouse experiment with 78 new lysimeter experiments to now close to 400 experiments in total.

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Dirk PaesslerFebruary 3, 2024
24/7 Monitoring of soil gas pCO₂ concentrations in large scale ERW experiments with low cost electronics
24/7 Monitoring of soil gas pCO₂ concentrations in large scale ERW experiments with low cost electronics

We document our latest pCO₂ sensor design and share a preview of our pCO₂ data while comparing these with the CDR estimates we recently derived from alkalinity.

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Dirk PaesslerJanuary 22, 2024
[XMAS Special] Watch Carbdown TV over the holidays!
[XMAS Special] Watch Carbdown TV over the holidays!

Here is a look at Carbdown’s year 2023 with a collection of videos about our work!

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Dirk PaesslerDecember 21, 2023
CDR Estimates Using Leachate Alkalinity - An Update With Improvements And One Correction
CDR Estimates Using Leachate Alkalinity - An Update With Improvements And One Correction

We update our document from 3 weeks ago about estimating carbon dioxide removal (CDR) by enhanced rock weathering (ERW) using measurements of alkalinity in leachate waters.

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Dirk PaesslerDecember 18, 2023
How much faster is rock weathering in our greenhouse compared to the field?
How much faster is rock weathering in our greenhouse compared to the field?

How do we “transfer” weathering rates measured in our greenhouse to the outside world?

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Dirk PaesslerDecember 6, 2023
CDR Measurement for ERW via Alkalinity in Leachate (Data From Our Greenhouse Experiment, Part 2)
CDR Measurement for ERW via Alkalinity in Leachate (Data From Our Greenhouse Experiment, Part 2)

In this blogpost we explain how the carbon dioxide removal (CDR) effects of weathering rock can be estimated using alkalinity measurements and what early results we see in our greenhouse experiment.

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Dirk PaesslerDecember 1, 2023
Data from the Greenhouse Experiment, Part 1: Biomass
Data from the Greenhouse Experiment, Part 1: Biomass

In part one of our greenhouse data series we publish the biomass data from our greenhouse experiment (how much has biomass changed after adding rock dust to different soils?).

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Dirk PaesslerNovember 6, 2023
Carbdown Greenhouse: How We Juggle Over 4 Million Data Points Daily in Real-Time. And Why.
Carbdown Greenhouse: How We Juggle Over 4 Million Data Points Daily in Real-Time. And Why.

Why we use high frequency monitoring on a slow process and how we handle and analyze more than 4 million data points per day in real time

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Dirk PaesslerOctober 24, 2023
Turn it to *11*! The greenhouse tactics that accelerate our ERW research
Turn it to *11*! The greenhouse tactics that accelerate our ERW research

While we are preparing a first look at the weathering data we have also looked at how the ambient climate in the greenhouse has developed since January. Here is an overview of this data.

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Dirk PaesslerOctober 17, 2023
Photo Diary: First 7 Months of Rock Weathering in the Carbdown Greenhouse
Photo Diary: First 7 Months of Rock Weathering in the Carbdown Greenhouse

A photo diary of the things that happened in the greenhouse.

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Dirk PaesslerOctober 11, 2023
Quantification of ERW: Suggesting the concept of “stages” for MRV
Quantification of ERW: Suggesting the concept of “stages” for MRV

Drawing from our experience, we hereby propose the concept of “scopes” to simplify the process. This concept is also used in the Greenhouse Gas Protocol standard to categorize greenhouse gas emissions. We'll apply this same idea to ERW.

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Dirk PaesslerAugust 7, 2023
Video: Project Carbdown: Experiences with several MRV approaches (The theory and practice of measuring ERW)
Video: Project Carbdown: Experiences with several MRV approaches (The theory and practice of measuring ERW)

Our CEO held a conference session about our scientific work with measuring of enhanced rock weathering on croplands.

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Dirk PaesslerJune 11, 2023
Monitoring CO₂ Concentrations in Soil Gas: A Novel MRV Approach for Cropland-Based ERW?
Monitoring CO₂ Concentrations in Soil Gas: A Novel MRV Approach for Cropland-Based ERW?

After more than two years of ERW experiments we still fail to measure carbon dioxide removal with traditional chemical analyses and electronic soil sensors. But when we started to monitor CO₂ concentrations in soil gas we found a signal immediately!

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Dirk PaesslerMay 17, 2023
XXL Lysimeter Experiment: Scientific documentation of the first three months (Master Thesis)
XXL Lysimeter Experiment: Scientific documentation of the first three months (Master Thesis)

The building process of our XXL Lysimeter project in May 2022 and the monitoring of the first 3 months was closely documented in a Master Thesis.

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Dirk PaesslerMay 17, 2023
Diagramm: The Annual Carbon Cycle on 1 m² of Cropland - With Enhanced Weathering
Diagramm: The Annual Carbon Cycle on 1 m² of Cropland - With Enhanced Weathering

A graph that shows the annual Carbon Cycle (carbon pools and carbon fluxes) for 1 m² of cropland including the Carbon Removal Effect of Enhanced Rock Weathering

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Dirk PaesslerApril 19, 2023
Setting up the Carbdown Greenhouse Experiment 2023 (With Recipe And Shopping-list)
Setting up the Carbdown Greenhouse Experiment 2023 (With Recipe And Shopping-list)

How we built the Carbdown Greenhouse Experiment 2023, including the reasoning of the design, our shopping list and the building recipe.

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Dirk PaesslerMarch 16, 2023
Photo-Album: What ERW Looks Like — Projects Around the World
Photo-Album: What ERW Looks Like — Projects Around the World

This is how spreading 50.000 tons looks like! We have asked people from around the world that are doing enhanced weathering projects with basalt or other rocks to send us some photos and a short description of their work.

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Dirk PaesslerDecember 19, 2022
How CDR with rock weathering can be done practically and profitably (Part 1)
How CDR with rock weathering can be done practically and profitably (Part 1)

Our pilot project with 1217 tons of basalt demonstrates the full value chain for ERW at € 230 per ton of CO₂ (with € 100-150 in sight)

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Dirk PaesslerDecember 14, 2022
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