"All the CO2 that is produced by burning one liter of oil can be sequestered by less than one liter of olivine." [1].
Given that formulation I assume that the amount of olivine needed is the same order of magnitude as the 1 liter of oil to produce the CO2.
The world is consuming 97 Mio barrels of oil per day [2]. I doubt we can mine that amount of olivine on a daily basis. Is it even available in that quantity?
How is olivine considered an adequate option to reduce the CO2 in the atmosphere?
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[1] that Wikipedia article above.