Tech and investment drive Africa's green cement revolution :

As innovative cement technologies enter Africa, the green cement market is set to hit $867.9 million in four years.

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South Africa , Egypt , Morocco , Ghana , Germany , Chad , Kenya , Burkina Faso , Zambia , Konza , Rift Valley , Nigeria , Mali , German , Thomas Demmel , Bobo Dioulasso , Seth Onyango , , West Africa ,