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After taking into account the emissions produced from mining and shipping the brucite from China, the final tally, he says, should come to at least 100 tons less CO2 warming the planet.

By comparison, the added brucite might raise the water’s pH by 0.1—roughly 25%.

There is also no guarantee that all the brucite poured into the harbor will translate into CO2 pulled from the atmosphere.

If it settles out, the brucite could even interrupt chemical reactions that dissolve naturally occurring alkaline materials in the sediment, which would cancel out some of the climate benefit.

Now, she wants to predict how the added brucite will alter the harbor’s water chemistry.