而不是使用碳酸氢钠为什么不使用石灰石替代呢?石灰石已经用于工业规模来中和酸和酸性的解决方案。碳酸氢钠也需要制造,而石灰石只需要挖出。碳酸氢钠的制造业将会不必要地使用能源,甚至还会产生更多的二氧化碳,如果它被用来抵消世界海洋。多伦多大学的丹尼·哈维已经看着[这][1]。他的解决方案是存款4 Gt /石灰石进入海洋。从另一个角度看,2013年全球煤炭生产][2]在7.823 GT这近两倍,这是超过(2014年全球铁矿石产量)[3]3.22 GT。这么多的开采石灰石将是一个庞大而昂贵的事业。还有磨的石灰岩40美元的额外成本\μm美元,按照丹尼哈维。添加到这将是沉淀成本的细碎石灰石海洋。因为石灰石不能将倾倒在一个沿海的位置,然后分散在全球范围内,这将需要的船队沉积灰岩在海洋。 The other things to consider include: - Are there sufficient quantities of easily obtainable limestone to do this? - What would such a use of limestone do to the supply and cost of cement, used for construction, etc.? - What impact would such a huge annual deposition of limestone have of ocean life forms and biodiversity? The other thing that Danny Harvey states in his is that 4 GT of limestone would need to be deposited in the oceans annually for at least 200 years for "a modest additional benefit". [1]: http://www.whoi.edu/cms/files/HARVEY_Scripps_Ocean_Acidification_28205.ppt [2]: http://www.worldcoal.org/resources/coal-statistics/ [3]: https://en.wikipedia.org/wiki/List_of_countries_by_iron_ore_production