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Self containing environments? Such as a photobioreactor vs an open pond? The thing about reactors is that they are expensive to build and maintain, but you get a better yield. Open outdoor systems are cheap to build and run, but you have to deal with contamination. Again harvesting the algae on a large scale, and preserving them until processing offsite is an issue. But there are a whole lot of people trying to crack this egg. It is going to happen, just a matter of time.
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