NOVELTY - Lubricant and drag reducing composition (I) comprises: a polyol component comprising mannitol derived from marine macroalgae; and a polymer component comprising a high molecular weight polymer derived from marine macroalgae, where the polymer having a molecular weight of greater than 100000.    USE - (I) is useful for making a natural algae synthetic lubricant composition, biofuel feedstock and a biofuel (all claimed), lubricants, lubricant additives, bio-based chemicals, oil remediation dispersants and sorbents, non-toxic health supplements, nutraceutical, cosmeceutical and pharmaceutical products/ingredients, horticultural and aquacultural feed or supplements, and a recoverable source of trace elements.    ADVANTAGE - (I) is environmentally-friendly, safe, regenerable, and non-depletable energy source.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) a lubricant composition comprising a base fluid consisting of automotive lubricants, industrial lubricants, marine oils and process oils, and a natural algae-based synthetic lubricant composition comprising a mixture of mannitol derived from marine macroalgae and a high molecular weight polymer derived from marine macroalgae having a molecular weight greater than 100000;    (2) making a natural algae synthetic lubricant composition comprising: harvesting marine macroalgae from the ocean; collecting at least a portion of sieve sap from the macroalgae; drying the sieve sap to remove a substantial amount of moisture; and removing a substantial amount of salts and oxides from the dried sieve sap;    (3) a method of making a biofuel feedstock comprising: harvesting marine macroalgae from the ocean; drying the marine macroalgae to remove substantial water content; treating the marine macroalage to remove salts; extruding the dried and desalted marine macroalgae into a predetermined shaped and sized solid feedstock material; and    (4) making a biofuel comprising: harvesting marine macroalgae from the ocean; drying the marine macroalgae to remove substantial water content; treating the marine macroalgae to remove salts; pyrolyzing the dried and desalted marine macroalgae; and recovering a biofuel material produced by pyrolysis of the dried and desalted marine macroalgae;    (5) method of recovering trace metals from marine macroalgae comprising the step of treating waste products with a process suitable to remove trace metals; and    (6) a method of making a soil remediation product comprising capturing the biochar products from the pyrolysis step.