> Concrete is responsible for 8% of global CO2 emissions. Cement is usually made from mined limestone. [Snip] We make synthetic limestone using atmospheric CO2,

> Concrete is responsible for 8% of global CO2 emissions. Cement is usually made from mined limestone. [Snip] We make synthetic limestone using atmospheric CO2, [snip] when [snip] used to make cement, [snip] (it) is carbon neutral. You should put that (slightly edited) paragraph on your home page. I looked at your home page first and didn't understand what you did until I came back here. Best of luck! (Btw: Try to avoid using the passive voice.)