NOVELTY - Isolated Chlorella sp. composition (I), where the isolated Chlorella sp. genome (II) comprises one or more nucleic acid sequence of SEQ ID Nos. 1-6 (Not defined) or their complements.    USE - (I) is useful: for removing nutrients from wastewater or gas; for producing lipid and biomass (claimed), which is useful for e.g. animal feed and organic fertilizer.    ADVANTAGE - (I): has high lipid content; possess tolerance to high carbondioxide; and/or can grow in waste water. (I) is more effective to remove nutrients from waste water/gas; and to produce lipid and biomass, than the conventional processes. (I) can be applied in non-agricultural environments such as arid and semi-arid environments (including deserts). The method only removes nutrients from waste water/gas, but also recycle them in form of renewable biomass and fine chemicals. (I) controls the environmental pollution while producing renewable energy.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) a substantially pure culture, comprising a growth medium; and (I); #an algal culture system, comprising a photobioreactor; and the substantially pure culture; (2) a method for lipid isolation, comprising culturing a Chlorella sp., where the culturing is done under conditions suitable for proliferation of the Chlorella sp., and extracting lipid from the Chlorella sp.; (3) methods for removing nutrients from wastewater/gas, comprising culturing a Chlorella sp., where the culturing is done under conditions suitable for proliferation of the Chlorella sp., and the culturing is carried out in a culture medium comprising at least 5% wastewater or gas, under conditions, where the nutrients in the wastewater are removed by the Chlorella sp.; and (4) a method for producing biomass, comprising culturing a Chlorella sp., where the culturing is carried out under conditions suitable for proliferation of the Chlorella sp., and harvesting algal protein and/or biomass components from the cultured Chlorella sp..