Is it possible to convert methane and carbon dioxide to acetic acid? Please forgive a bumbling amateur.  I have been looking up bond strengths and it seems to me that it should be possible to combine methane with carbon dioxide to make acetic acid:

$$\ce{CH4 + CO2 -&gt;[\color{red}{?}] CH3COOH}$$

One has to break a C=O bond (745 kJ/mol) and a C–H bond (413 kJ/mol), but one gets back a C–O bond (358 kJ/mol), an O–H bond (467 kJ/mol) and a C–C bond (347 kJ/mol) so one comes out ahead.  I know that bond energies vary slightly but this doesn't sound too far out of whack.  Wouldn't it be rather nice if one could catalyse this reaction and soak up lots of these readily available gases? Could we induce some bacterium to do it for us?
Already methanotrophic bacteria can oxidize methane to formate and the Wood-Ljungdahl pathway can take this formate and a carbon dioxide molecule and coenzyme A and produce acetyl coenzyme A so the catalysts are already there.