Eating the seaweed would not be sequestered CO2. Your body, like a furnace, would break the seaweed down and re-release the CO2. Better sequestration, would b

Eating the seaweed would not be sequestered CO2. Your body, like a furnace, would break the seaweed down and re-release the CO2. Better sequestration, would be to grow the seaweed and then bury it. Then in a million years future Earth inhabitants could dig up that broken down seaweed and have a new oil rush.