I've wondered about that too. The sunlight is harvested and brought inside somehow. I don't know what the method is, but as a hypothetical, if it was optical fibres on top of the container feeding it inside, stacking them two high would mean only half as much light. 10 high only 10% as much light, etc.
Maybe it's so intensive that only a small area is used to house algae, and wherever there is a CO2 source there's a building with a roof which will always be larger than the area needed for sunlight harvesting.
It does sound strange, but presumably they have that side of things figured out.
AEB Price at posting:
11.5¢ Sentiment: Sell Disclosure: Not Held
