Microscopic green algae are nutritious like higher plants, because they contain vitamins, minerals and organic material. However, they are not necessarily palatable like higher plants.
Some forms of green algae (Chlorella) are grown in mass culture, dried and made into tablets for consumption as a food supplement. However, caution is advised due to an excess of nucleic acids, which can have adverse effects.
Green algae have been promoted as potential bio-fuels, because they can produce and store oils. With the volatile oil production market and concerns about rising carbon dioxide levels associated with climate change, the development of bio-fuels is creating more interest among politicians and is more attractive for investors. Presently, the use of algae for bio-fuels is not economically feasible and extensive research must be conducted to demonstrate the technological practicality.