The concrete-cement industry is responsible for at least 8 percent of global CO2 emissions, about the same as cars. Ordinary cement manufacturing heats limestone, which has heaps of embedded CO2. Brimstone, however, produces its cement through a process that uses calcium silicate rocks without any embedded CO2. Brimstone Energy has invented a way to make carbon negative Portland cement that is identical to conventional cement and lower in cost.

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Funding Events

Date	Amount	Type	Investors	Valuation
05/02/22	$55,000,000		Amazon's Climate Pledge Fund Breakthrough Energy Ventures DCVC Fifth Wall Ventures	undisclosed