NOVELTY - Copolymer of ethylene and at least one unsaturated carboxylic acid or its derivative in which ethylene is at least partly derived from renewable raw materials, is claimed.    USE - The copolymer is useful: as an adhesive or adhesive composition in coextrusion, extrusion coating or extrusion lamination; for forming films, encapsulating film for solar panels, particularly food packaging films, resilient flooring including construction for the floor or walls or in the car, thermo-adhesive, in the composition of soundproofing mass, flexible parts such as tubes or bottles, electric cable sheaths, for the modified bitumen and for forming thermofusible adhesive; as a compatibilizer compounds; and as an impact modifier in polymers (all claimed).    ADVANTAGE - The process avoids using ethylene, which is highly reactive and causes oligomerization side reactions. The process can be implemented in production units located on the place of production of raw materials. The size of production units of the process is much smaller than the size of a refinery, which are indeed large facilities usually located far from centers of production and raw materials supplied by pipelines. The process is economical.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) preparing the copolymer of ethylene and at least one unsaturated carboxylic acid or its derivative comprising: fermentation of renewable raw materials and optionally purification to produce at least one alcohol or its mixture comprising ethanol; dehydration of the resulting alcohol to produce at least one olefin or its mixture comprising ethylene and, optionally purifying the alkene for the ethylene copolymerization of ethylene with at least one comonomer comprising unsaturated carboxylic acid; and isolation of the obtained copolymer; and    (2) a composition comprising the copolymer containing a terpolymer of ethylene, ester of unsaturated carboxylic acid and a comonomer comprising unsaturated carboxylic acids, anhydrides of unsaturated carboxylic acids and unsaturated epoxides, or a mixture of a copolymer of ethylene and ester of unsaturated carboxylic acid and a copolymer of ethylene and at least one comonomer comprising unsaturated carboxylic acids, unsaturated carboxylic acid anhydride and unsaturated epoxides.