1. Portland Cement Association (PCA).Roadmap to Carbon Neutrality;2021. Available from:https://www.cement.org/docs/default-source/roadmap1/pca-roadmap-to-carbon-neutrality_final.pdf
2. California Legislative Organization.Buy Clean California Act [3500–3505];2017. Available from:https://leginfo.legislature.ca.gov/faces/codes_displayText.xhtml?division=2.&chapter=3.&part=1.&lawCode=PCC&article=5.
3. Colorado General Assembly.Global Warming Potential for Public Project Materials; House Bill 21–1303;2021. Available from:https://leg.colorado.gov/bills/HB21-1303
4. Oregon State Legislature.HB 4139‐ Relating to reductions of greenhouse gas emissions in the state's transportation system; and prescribing an effective date;2022.
5. Marin County.Section II: Marin County Code Chapter 19.07 Added to Marin County Code Title 19: Low Carbon Concrete Requirements;2019[cited 2022 Jun 19]. Available from:https://www.marincounty.org/-/media/files/departments/cd/planning/sustainability/low-carbon-concrete/12172019-update/low-carbon-concrete-code.pdf?la=en