Don’t wait to be a millionaire for that. See if you can find people who are also interested in it and build it as a co-op.
That said, I think you’ll run into problems with the square-cube problem. Volume of algae goes up by a cube factor, but they need light. That light has to be fed by energy that has to be gathered by taking up surface area of the Earth, like solar and wind, but that only goes up by a square factor. Hydro and nuclear sources are maybes here, but you’d have to scale way, way up to make that viable (many billions of dollars, not millions). Presumably, you don’t want to use energy from carbon-based sources just to suck that carbon back into algae.
Don’t wait to be a millionaire for that. See if you can find people who are also interested in it and build it as a co-op.
That said, I think you’ll run into problems with the square-cube problem. Volume of algae goes up by a cube factor, but they need light. That light has to be fed by energy that has to be gathered by taking up surface area of the Earth, like solar and wind, but that only goes up by a square factor. Hydro and nuclear sources are maybes here, but you’d have to scale way, way up to make that viable (many billions of dollars, not millions). Presumably, you don’t want to use energy from carbon-based sources just to suck that carbon back into algae.