Sustainable Cultivation. Microalgae cultivation features several environmentally sustainable elements. Microalgae are a sustainable protein source as they do not consume water to grow (although water is the perfect environment for their movement, they do not feed on it). They have a low land footprint, allowing to keep farmland for more important uses. Since they are biological organisms, they use CO2 (1,7/2,0 kg of CO2 consumed per 1 kg of microalgae product) producing oxigen (considering that 150 kg of produced microalgae yield an amount of oxygen equivalent to what 4 hectares of forest yield).