Saving the Great Barrier Reef?

A paper in Environmental Research Letters confirms that it is possible to save Australia's Great Barrier Reef by dropping alkaline, crushed rock along existing shipping routes (https://www.theguardian.com/environment/2021/jun/08/could-dumping-save-the-reef-csiro-finds-its-possible-to-turn-back-clock-on-effects-of-fossil-fuel-burning). The reef is threatened by emissions of carbon dioxide. This 'greenhouse gas' dissolves in seawater, creating carbonic acid. The acid prevents the corals from forming their calcareous skeletons. The crushed limestone would increase the pH in the immediate vicinity of the reef organisms. Although this 'solution' is theoretically possible, it comes with 'unquantifiable risks'. It would be rather better (for climate change, as well as the reef) for Australia to cease mining, burning and exporting coal. Simples!