- While there have been several bills introduced in California recently to reduce emissions from cement, only one has been signed into law. Senate Bill 596 (SB 596), passed in September 2021, requires the California Air Resources Board (CARB) to develop a strategy for the cement industry to reduce emissions by 40 percent below the 2019 average levels by the end of 2035 and to achieve net-zero emissions by 2045.58