NOVELTY - An isolated Pseudochlorococcum sp. composition, where the isolated Pseudochlorococcum sp. genome comprises one or more nucleic acid sequence selected from SEQ ID NO: 1-5, or their complements, is new.    USE - The Pseudochlorococcum sp. is useful for lipid isolation, removing nutrients from wastewater, removing nutrients from waste gas, and for producing biomass (all claimed).    ADVANTAGE - The present invention provides algal species and compositions, methods for identifying algae that produce high lipid content and possess carbon dioxide (CO2) tolerance, and methods for using such algae for effective lipid isolation, wastewater remediation, waste gas remediation, and/or biomass production.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are: (1) a substantially pure culture comprising a growth medium, and the isolated Pseudochlorococcum sp.; (2) an algal culture system comprising a photobioreactor, and the substantially pure culture; (3) a method for lipid isolation by culturing a Pseudochlorococcum sp., where the culturing is done under conditions for proliferation of the Pseudochlorococcum sp., and extracting lipid from the Pseudochlorococcum sp; (4) a method for removing nutrients from wastewater by culturing a Pseudochlorococcum sp., where the culturing is done under conditions for proliferation of the Pseudochlorococcum sp., and where the culturing is carried out in a culture medium comprising at least 5% wastewater, under conditions where nutrients in the wastewater are removed by the Pseudochlorococcum sp.; (5) a method for removing nutrients from waste gas by culturing a Pseudochlorococcum sp., where the culturing is done under conditions for proliferation of the Pseudochlorococcum sp., and where the culturing is carried out in a culture medium comprising waste gas, under conditions where nutrients in the waste gas are removed by the Pseudochlorococcum sp.; and (6) a method for producing biomass by culturing a Pseudochlorococcum sp., where the culturing is carried out under conditions for proliferation of the Pseudochlorococcum sp., and harvesting algal protein and/or biomass components from the cultured Pseudochlorococcum sp.