The growing problem of the world's high dependence on fossil energy sources as well as the need to reduce the related environmental damages make it increasingly necessary to use renewable resources for meeting our energy demand. Algae's potential as a feedstock is dramatically growing in the biofuel market. Microalgae have many desirable attributes as energy producers (based on Um and Kim 2009):
Carbon-dioxide is one of the most important greenhouse gases in conjunction with methane, nitrous oxide, ozone and chlorofluorocarbons; even so carbon-dioxide is essential for photosynthesis. Increasing the concentration of carbon-dioxide the growth rate of algae cells increases as well. This ability of algae provides facilities to use algal cells for decreasing the CO2 emission.