> 215 billion tons of carbon dioxide over the next 75 years if spread across croplands globally. But for how long does the rock 'function' before needing to be

> 215 billion tons of carbon dioxide over the next 75 years if spread across croplands globally. But for how long does the rock 'function' before needing to be replaced? I'm doubtful that it would work at the same rate over just a few years, let alone 75. With the need for massive mining, transportation and application of the rock at regular intervals I wonder if it would erode what ever gains this gives us.