Green algae grow like mad when fed CO₂, and if turned into biofuel can yield up to 100 times the biofuel per hectare as corn, soy or sugar cane crops. Petroalgae of Melbourne, Florida, plans to license their first 2000-hectare commercial alga biodiesel plant in China next year and says the green stuff can ingest C0₂ straight from the smokestacks of power plants. If emissions from all the world's power plants were harnessed for alga growing and recycled as biodiesel, C0₂ emissions would drop by roughly 9 billion tonnes per year.