Says this article. First I thought its the good old nimbu that theyll be squeezing into the oceans, and was wondering how they were planning to grow so many limes. But then I discovered its actually limestone lime they are talking about. Scientists claim that if you add lime to sea water it increases its ability to absorb carbon from the atmosphere. This solution has been in circulation for many years but the problem is that too much lime is required (obviously) and the process of extracting lime from limestone releases lots of CO2 into the atmosphere.
The new process of obtaining lime from limestone does generate CO2, but once this lime is added to the sea water the sea water will absorb double the amount released, this means the level of carbon dioxide in the atmosphere can be brought to the level of pre-industrial age. Australia’s Nullarbor Plain is being considered for the project as it has 10000 cubic kilometers of lime.
But what will happen to the extra carbon the sea absorbs? Maybe then the absorbed carbon will be re-absorbed by the marine plant life releasing oxygen in return. Sounds good.