From what i understand, C02 sequestration means storing the carbon-di-oxide underground or under ocean and prevent it from being entering into the atmosphere. But, in algae based CO2 sequestration systems, the companies claim that they are sequestering their carbon-di-oxide emissions using algae and in turn using the algae produced for biofuel production.
Thus produced biofuels when used again releases the same amount of carbon-di-oxide consumed by the algae while growing. May be the net CO2 emission can be zero but this is not sequestration since this releases the CO2 consumed.
i appreciate your opinion on this.
regards,
GURU