A method for producing insect feed is disclosed, the method comprising: passing a gas stream containing CO2 into a solution containing water and algae, harvesting algae from the solution, and processing the harvested algae to produce insect feed. Also provided is a system for producing algae comprising: a diversion valve connectable to a gas outlet of an industrial plant so as to divert a gas stream from the industrial plant, a photobioreactor containing a solution containing water and algae, and a gas channel fluidly connecting the diversion valve and the photobioreactor, wherein the gas channel is configured to pass the diverted gas stream into the solution contained in the photobioreactor.

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