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let's build

A climate positive world is built

on a carbon negative foundation

introducing the world's first carbon negative portland cement

We can transform the cement industry from climate problem to climate solution.
Cement is one of the most used materials on the planet. It's also a huge source of global emissions.
Over 4 billion tons of cement is produced each year—a number only expected to grow. The problem is cement production accounts for 7.5% of global CO
2 emissions, which is nearly the amount of emissions produced by all of the cars on the road. In fact, if cement were a country it would be the third largest emitter in the world. We're here to change this with our breakthrough process that makes carbon negative cement. It's the exact same material builders have relied on for over a hundred years, now with a positive climate impact. 

carbon negative

The Brimstone Process™ is carbon negative, removing CO2 from the air.

low cost

The Brimstone Process™ is cost competitive at scale.

zero trade-offs 

The Brimstone Process™ makes cement that is chemically and physically identical to conventional portland cement.

we are a climate tech company working on the most impactful solutions for the industrial sector


In order to make the most impact for the climate, entire industries need to transform—fast. That is no easy task, but that's why we started Brimstone. We're a team of scientists, problem-solvers, engineers, innovators and builders on a mission to solve the hardest climate problems in an economically competitive way in order to accelerate the evolution of critical industries for the climate era. We're starting with cement.



bench-scale validation


pilot plant

In progress

first commercial plant

Securing advance commitments


Coming soon

join the team

Join our mission to decarbonize the cement industry and cut global emissions. We're hiring amazing people motivated to make a gigaton impact to come build the future with us.

let's build

We are working with industry leaders and other key partners to scale and maximize our impact on climate change. Interested in joining the fight? We’d love to talk.

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