Regarding ‘Algae: The ultimate biofuel‘:
Your section headed “no competition for land” ends by describing algae as “ending the potential for conflict with food production which comes with increased energy crop cultivation”.
We’d all like this to work, but let’s not get carried away. If this could work profitably there would be the incentive to do it anywhere that is readily accessible and with suitable amenities.
You can grow strawberries and tomatoes under greenhouses in the desert, but plenty are also grown under polytunnels and greenhouses on viable temperate farmland. So regulation of photobioreactor sites would also need to play a part.