big fan of g.o.d. but this strikes me as a very,very bad idea - extra credit to anyone who can tell me why!

 Proceedings of the National Academy of Sciences | Light-driven carbon dioxide reduction to methane by nitrogenase in a photosynthetic bacterium

Significance

One of the most important life-sustaining metabolisms that results from a net reduction reaction is the conversion of nitrogen gas to ammonia by nitrogenase in a process known as nitrogen fixation. A nitrogenase variant has been described that converts carbon dioxide to methane in vitro. Here, we expressed this variant in an engineered strain of the photosynthetic bacterium Rhodopseudomonas palustris and showed biological light-driven methane production. Its ability to reduce carbon dioxide at ambient temperature and pressure with a single enzyme and energy provided by light makes the methane-producing strain of R. palustris an excellent starting point to understand how a biological system can marshal resources to produce an energy-rich hydrocarbon in one enzymatic step.