Back in the 1980s when I believed that AGW was real, I was proposing stimulating the growth of marine algae with which to feed Foraminifera as the only reasonable way to sequester massive amounts of carbon at reasonable cost.
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Over hundreds of millions of years these tiny creatures have swarmed the ocean bestowing to the planet their exquisite dwellings, a smidgen of which was once fashioned into the Egyptian Pyramids