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How our solution works

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With over 1 billion tons per year, demolition concrete is the world's single largest waste stream. So what about turning this waste stream into a ‘sink’ that absorbs unavoided emissions from the atmosphere?

Neustark has developed a solution to do exactly so: by capturing then mineralizing CO₂ in demolished concrete. This process works as an add-on to concrete’s normal recycling process. The CO₂ is stored permanently – and thus removed from the atmosphere.

We’re turning demolition waste into a carbon sink.

Neustark stores around 10kg of CO₂ per ton of demolished concrete. One site can do in one hour what 50 trees do in one year.

This is how it works


To source the CO₂, we work with biogas plants that separate CO₂ from methane through a process called biogas upgrading. With our technology installed at the plant, neustark captures and liquefies the vastly pure CO₂ offgas.

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We then transport it to nearby sites where we sink the CO₂. We partner with construction recyclers to harbor our mineralization technology at their plants, where we inject the CO₂ into finely crushed demolition concrete granules.

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Through the accelerated mineralization process that our technology triggers, the CO₂ then turns into limestone and is bound to the demolition concrete granules’ pores and surface. This happens alongside the recycler’s existing process of processing demolition waste to use to build streets or produce fresh recycled concrete.

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Et voilà, the CO₂ is stored – permanently, i.e. the risk of reversal is slim to none. We’ve removed CO₂ that would otherwise be released in the atmosphere. And since the CO₂ we captured is of biogenic nature, we create negative emissions

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We help businesses achieve their climate goals by removing their unavoided CO₂ emissions. More and more organizations are embedding carbon removal, next to their reduction efforts, in their climate strategies. They partner with neustark to acquire certified carbon removal (CDR).

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Neustark’s role

Neustark was the first to show that this value chain is both ecologically and commercially viable. And the first to deploy its solution at various sites across Europe – already removing CO₂ today, and even more tomorrow.

By broadly deploying our proven solution, we can reduce the operational costs and thus decrease the price for carbon removal – and significantly increase the amount of CO₂ we store.

Neustark creates negative emissions by storing CO₂ in demolished concrete, the largest waste stream in the world.

So why store CO₂ in demolition concrete?


The mineralization process in concrete permanently stores the CO₂. The risk of reversal is proven to be slim to none, and the CO₂ is stored for thousands to millions of years.

Gigaton potential

Demolished concrete is the world’s largest waste stream. It’s an existing material, which offers a storage potential of numerous gigatons per year.

Easy to scale

We work with concrete recyclers alongside their existing processes. The industry is already in place, and we add on our technology without disturbing the status quo.