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The sunlight , CO2 and water transforms the alga into biomass. It is known that fuel can be made out of biomass. After the alga liquid is saturated with carbon-dioxid it needs to be led to tubes, which are under the ground. The tubes lead the biomass to the closest filler station. Here, biofuel is made of that for the environmentally friendly cars. After this the street lamps should be refueled with alga.