A method for the production of value added chemicals comprising: introducing carbon dioxide to a system comprising an electrochemical cell comprising a carbon dioxide reducing catalyst and an electrolyte under conditions suitable for conversion of carbon dioxide to one or more C.sub.2 compounds; introducing at least a portion of the one or more C.sub.2 compounds to a second system comprising a microbe and a media under conditions suitable for conversion of the C.sub.2 compounds to one or more C.sub.2+n compounds where n is from about 1 to about 100. A method of preparing value added chemicals comprising: a means for converting carbon dioxide to one or more C.sub.2 compounds and a microbe wherein the C.sub.2 compound is contacted with the microbe under conditions suitable for the formation of one or more C.sub.2+n compounds.

A genetically engineered microbe capable of producing isoprene from a carbon source and method related thereto include a first nucleic acid sequence encoding a first enzyme, wherein the first enzyme is configured to catalyze one or more steps of a conversion from the carbon source to acetyl coenzyme A (A-CoA), a second nucleic acid sequence encoding a second enzyme of a mevalonate (MVA) pathway, and a heterologous nucleic acid sequence encoding a third enzyme, wherein the third enzyme is configured to catalyzing an isoprene-producing chemical reaction.

The subject invention pertains to environmentally-friendly compositions, methods and systems for the production of diesel biofuels. More specifically, the subject invention integrates electrocatalysis and microbial bioconversion to generate lipids from carbon dioxide in a way that increases energy efficiency over known biomass-derived diesel production and significantly reduces land use.