NOVELTY - Method (M1) (500) for producing a first product from a first region of an electrochemical cell having a cathode and a second product from a second region of the electrochemical cell having an anode, comprises: contacting (510) first region with a catholyte comprising carbon dioxide; contacting (520) second region with an anolyte comprising a recycled reactant and carbon based reactant e.g. alkane; and applying (530) an electrical potential between anode and cathode sufficient to produce a first product recoverable from the first region and a second product recoverable from the second region.    USE - The method is useful for producing a first product from a first region of an electrochemical cell having a cathode and a second product from a second region of the electrochemical cell having an anode, where: the first product is at least one of carbon monoxide, formic acid, formaldehyde, methanol, methane, oxalate, oxalic acid, glyoxylic acid, glyoxylate, glycolic acid, glycolate, glyoxal, glycolaldehyde, ethylene glycol, acetic acid, acetate, acetaldehyde, ethanol, ethane, ethylene, lactic acid, lactate, propanoic acid, propionate, acetone, isopropanol, 1-propanol, 1,2-propylene glycol, propane, propylene, 1-butanol, 2-butanone, 2-butanol, butane, butane, carboxylic acid, carboxylate, ketone, aldehyde and alcohol; and the second product is a polyhaloalkene, perhaloalkene, polyhaloalkane or perhaloalkane, or a halogenated compound (all claimed).    DETAILED DESCRIPTION - Method (M1) (500) for producing a first product from a first region of an electrochemical cell having a cathode and a second product from a second region of the electrochemical cell having an anode, comprises: contacting (510) the first region with a catholyte comprising carbon dioxide; contacting (520) the second region with an anolyte comprising a recycled reactant and carbon based reactant including at least one of alkane, haloalkane, alkene, haloalkene, aromatic compound, haloaromatic compound, heteroaromatic compound or halo-heteroaromatic compound; and applying (530) an electrical potential between the anode and the cathode sufficient to produce a first product recoverable from the first region and a second product recoverable from the second region. INDEPENDENT CLAIMS are also included for:    (1) a method (M2) for producing a first product from a first region of an electrochemical cell having a cathode and a second product from a second region of the electrochemical cell having an anode, comprising: receiving a feed of carbon dioxide at the first region of the electrochemical cell; contacting the first region with the catholyte comprising carbon dioxide; receiving a feed of a recycled reactant and at least one alkane at the second region of the electrochemical cell; contacting the second region with an anolyte comprising the recycled reactant and at least one alkane; and applying the electrical potential between the anode and the cathode; and    (2) a system for electrochemical co-production of products, comprising: an electrochemical cell including a first region, a cathode associated with the first region, a second region, an anode associated with the second region, and a separator for selectively controlling a flow of ions between the first region and the second region; a carbon dioxide source, where carbon dioxide source is in flow communication with the first region to supply carbon dioxide to the first region; a carbon-based reactant source, where carbon-based reactant source is in flow communication with the second region to supply a carbon-based reactant to the second region; a recycled reactant source, where the recycled reactant source is in flow communication with the second region to supply a recycled reactant to the second region; and an energy source for applying a current across the anode and the cathode, where when current is applied, a first product is recoverable from the first region and a second product is recoverable from the second region.    DESCRIPTION OF DRAWING(S) - The figure shows a flow diagram of a method of electrochemical co-production of products.    Method for producing first product from first region of electrochemical cell having cathode and second product from second region of electrochemical cell having anode (500)    Contacting first region with catholyte comprising carbon dioxide (510)    Contacting second region with anolyte comprising recycled reactant and carbon based reactant (520)    Applying electrical potential between anode and cathode sufficient to produce a first product recoverable from first region and second product recoverable from second region (530)