A Robotic Algae Harvester (RAH) of the present invention works by providing a CO.sub.2 collection mechanism that is installed in power plants or vehicles. These systems are available using current technology and have been proven to be scalable. CO.sub.2 is then transported to RAH using ships. The RAH will feed and re-circulate algae broth through the photobioreactors (PBRs). The PBRs float in the ocean while the algae through photosynthesis will transform the CO.sub.2 into biomass in a continuous process. The extracted algae will processed into a stable mix of oil and bi-product and transferred to the ship that brought the CO.sub.2. The algae is then processed onshore in some of the following manners: converted to biodiesel via transesterification; converted to bio-ethanol via fermentation; burned for electricity generation; and/or used as protein for animal feed or food products.