The ocean, often likened to the lungs of the planet, is the world's largest natural carbon sink. Now, companies such as Equatic, Captura, Running Tide and a startup called Ebb Carbon are using new technology to restore ocean chemistry and speed up its natural abilities. "We're restoring the balance in the ocean chemistry and enabling the ocean to absorb CO2 and convert it to a safe stable form," said Ben Tarbell, co-founder and CEO of Ebb Carbon. "Right now, there are very large voluntary carbon markets, large corporations willing to pay to remove carbon from the atmosphere to offset emissions in other parts of their business. In addition to Prelude, Ebb Carbon is backed by Evok Innovations, Congruent Ventures and Propeller.

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Persons: it's, Ben Tarbell, Tarbell, Gabriel Kra, Lisa Rizzolo Organizations: Ebb, Ventures, Prelude Ventures, Evok, CNBC Locations: Sequim Bay, Washington