Fossil resources (petroleum, natural gas, coal) are widely used for the production of basic organic chemicals.[1] This increasingly limited feedstock is at the end of the process in which CO2 is reduced to hydrocarbons by photosynthesis and subsequent biological and slow geochemical processes [Eq. 1]. n CO2þn H2Oþhν! ðCHOHÞnþn O2! ðCH2Þnþ1= n O2 ð1Þ