Cementing Carbon

To appreciate how fundamental a role cement plays in human society, one must first understand the importance of the carbon cycle in the evolution of the planet. Carbon dioxide (CO₂) in the atmosphere dissolves in seawater and gets metabolized by living corals and plankton that eventually die and decompose into ocean sediments. The sediments are compressed over millions of years until they become limestone – a natural storage vault for elemental carbon, like coal, oil and gas.