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Trees From Above

Meeting our Climate Goals

The CarbonStar Rating System  is essential to limiting global warming to 1.5 C and achieving a carbon neutral world by mid-century.


The Power of Procurement

Perhaps the most powerful tool governments have available to them is the power of procurement. This is especially true for concrete, as governments are by far the largest buyers of concrete.


There are a growing number of laws and procurement guidelines requiring the preferential use of low or negative-carbon concrete in both the public and private sector. The LECCLA (Low Embodied Carbon Concrete Leadership Act) in New York and New Jersey and Buy Clean California are two of the most prominent examples.

While these efforts are laudable, in order to maximize the potential of concrete as a carbon sink for emissions from across the economy – not just to offset the emissions of its own production, a simple, universal, and audit-able method for counting the carbon in concrete is needed.


CarbonStar provides minimum requirements and recommendations for the quantification and verification of the embodied carbon in a unit of concrete, including any carbon that is permanently sequestered during the production of concrete and/or its input materials.

The Precise Measurement of Embodied Carbon of Concrete

The CarbonStar Rating is the embodied carbon of concrete in mass of CO2 per unit of concrete. But in order to reach that figure, the CO2 sequestered in mass-per-unit of concrete must also be calculated.


The CarbonStar Rating System provides a simple, universal and auditable method for measuring the carbon in concrete.  The number generated by the Calculator may be used for the purposes of regulatory requirements or subsidies, such as the Section 45Q Federal Tax Credits

To learn more about the CarbonStar Rating System, please click the button at right to open your free CSA account. 

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