**5. Current usage of microalgae**

Microalgae have a specialty that it useful in various ways likes humans use algae as food, for production of useful compounds, as nutrient and fertilizer, wastewaters treatment and other pollutants removal from wastewater, as indicators of environmental change, in space tech‐ nology, and as laboratory research systems. Microalgae are capable of fixing CO2 in the atmosphere because when its grow using photosynthesis, also need CO2, which is waste of various sources and responsible for global warming worldwide.
