Cyanobacteria being a photoautotroph can be exploited to be used as a cell factory for the consumption of carbon dioxide to produce almost any desired compound, which in my case would be n-butanol, since it is considered a potential fuel substitute to gasoline with an energy density of 27MJ/L. My work involves genetic manipulation to introduce the butanol biosynthetic pathway genes in cyanobacteria (without disrupting its other functions) and adapting the various strains to higher tolerance of butanol since the production of butanol should not be inhibited or interfere with the growth of the cell.