[gonzo41]

The timescale is the issue for humanity.

I'm hoping someone can find, or mix and match an algae in lab that will have the right mix ofproperties to explosively grow.

Providing food stock will be tricky, either through something very efficient like straight sugar or designing the algae to consume anything which could have other upside benefits.

And like all well meaning engineering the real challenge will be making sure the algae that can grow by eating anything doesn't get out of the pond.

[Valgrim]

Algae are generally autotrophic, meaning they don't need sugar or food, they create sugars from CO2 and light, and they need nutrients like phosphorus and nitrate and other minerals to do so.

But if you provide too much nutrient, too much algae grow, and when they die and decompose they absorb all the oxygen in the water and kill the whole ecosystem. (That's called eutrophication).