Even if all emissions stopped tomorrow, the excess carbon currently in the atmosphere would take thousands of years to naturally dissipate through processes like photosynthesis, oceanic absorption, or mineralization. In addition to forests, soils, and the ocean, naturally occurring minerals are one of our planet’s most important carbon sinks. 

Over the span of hundreds or thousands of years, carbon dioxide in air and water binds to minerals, and eventually turns to stone, thus removing the carbon from the atmosphere. This process is called mineralization. One of the most abundant types of rocks on the planet is limestone, and it’s one of the unsung superstars of this carbon mineralization process. 

Meanwhile, one of the most exciting advances in the carbon removal industry that has received a lot of attention - and scrutiny - is Direct Air Capture, often referred to as “DAC.” DAC is the process of separating carbon dioxide from ambient air. The Inflation Reduction Act and Bipartisan Infrastructure Law specified funding for the deployment of DAC projects in the US, and DAC is getting more interest from companies looking to remove their carbon emissions. But, DAC technologies are typically expensive, energy and land intensive, and use materials that can be difficult to source. 

In order to remove billions of tons of carbon from the atmosphere, we need a DAC solution that is scalable, inexpensive, and designed to leverage natural processes like mineralization via limestone, which has millennia of carbon removal capabilities embedded in its chemistry. And that is exactly what Shashank Samala, Co-Founder and CEO of Heirloom, is building.

Sponsors

Watt It Takes is brought to you by Microsoft.

The $1 Billion Microsoft Climate Innovation Fund is investing in innovative technologies that have the potential for meaningful, measurable climate impact by 2030. To date, Microsoft has allocated more than $700M into a global portfolio of over 50 investments including sustainable solutions in energy, industrial, and natural systems. Visit https://www.microsoft.com/en-us/corporate-responsibility/ to learn more about Microsoft’s progress toward their impact commitments. 

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