Spirulina farming has many ecological benefits, when compared to other farmed food products:
In order to produce 1kg of spirulina, very little water is needed. The only significant loss is through evaporation.
The spirulina protein uses 1/3 of the amount of water needed to grow soy beans, and only 1/50 of the water needed for animal protein.
Growing spirulina requires very little surface area of land, with the further advantage that this land can be marginal and non-fertile, unsuitable for agriculture, such as marshes and thermal springs with brakish or alkaline water.
The spirulina protein needs 20 times less land than soy beans and 200 times less land than is required for animal protein production.
Spirulina can help in the struggle against global warming as it fixes carbon and produces oxygen.