[BitWielder1]

Where exactly would they put the million of acres of ponds needed to grow enough algae to make a dent.
It uses a lot of water, yes?
They need to get rid of dead algae and other waste, yes?
Better not tell the EPA.

[Reeses]

Where exactly would they put the million of acres of ponds needed to grow enough algae to make a dent.

This pond is big enough. It has free water, free farm fields, and free sunshine. It also has free fertilizer waste feeding into it. Algae blooms aren't a problem because of too much algae, but because of not harvesting it.

[wildbill]

Fossil fuels are effectively hidden by being below the surface of the Earth. To grow algae, you’d have to have huge topside growing platforms.

Has anyone ever seen a calculation of just how much surface area of algae you’d need to produce on 55 gal. drum of oil?