All it takes is energy. You MUST understand that the carbon-oxygen bond is very strong. In fact,it gives up a tremendous amount of heat when it forms (that is why heat is given off when carbon burns!).
There is not , to my knowledge, any economically viable method of 'un-burning' carbon-dioxide. Photo-synthesis is possible ONLY with the enzymatic/catalytic power of the chlorophyll molecule and the complex chemistry involved.
Chemical
Re: Chemical
