Algae fuel or algal biofuel may be a substitute to liquid fossil fuels that utilizes algae as its source of energy-rich oils. Also, algae fuels are a substitute to common known biofuel sources, like corn and sugarcane. Various companies and government agencies are sponsoring efforts to scale back capital and operating costs and make algae fuel production commercially feasible. Like fuel, algae fuel releases CO2 when burnt, but unlike fuel, algae fuel and other biofuels only release CO2 recently withdrawn from the atmosphere via photosynthesis as the algae or plant grew. The energy crisis and thus the planet food crisis have sparked interest in alga-culture (farming algae) for creating biodiesel and other biofuels utilizing land unbefitting for agriculture. Among algal fuels' attractive characteristics are that they will be cultivated with negligible impact on water resources, are often generated using saline and wastewater, have a high flash point, and are biodegradable and comparatively harmless to the environment if spilled. Algae cost more per unit mass than other advanced biofuel crops because of high capital and operating costs, but are declared to urge between 10 and 100 times more fuel per unit area.