due to the limited energy reserves and the increasing demand for energy, a large number of greenhouse gases such as co2 have been released to the air. therefore, there is an urgent need to find new sources of energy and ways which can effectively fix carbon dioxide. pleurochrysis carterae, a marine microalga is considered a potential biodiesel producer and and effective carbon dioxide fixer, due to its high lipid content (33% of dry weight) and a unique calcification process.