We are studying the photo-production of hydrogen. This production is catalyzed by the nitrogenase, a metalloenzyme complex that reduces atmospheric nitrogen into ammonia and hydrogen. Moreover, in the absence of molecular nitrogen, nitrogenase continues to reduce protons in H2 and acts, in some way, as a hydrogenase. Rhodobacter capsulatus bacterium used by these researchers is able of catalyzing the photolysis of a wide range of simple organic compounds and to convert them into hydrogen, suggesting applications in the clean-up and conversion of organic waste from agrobusiness.