So far, green waste and sewage sludge have mostly been composted or burned. It would make more sense to obtain the valuable energy carrier hydrogen from this. This is the goal pursued by a team of researchers at the Fraunhofer Institute for Manufacturing Engineering and Automation IPA. The CO2 produced during the production of hydrogen from waste is captured and used, for example, as a raw material in the chemical industry. In this way, the researchers produce hydrogen with a negative CO2 footprint from the biowaste using different processes. CO2 is thus removed from the atmosphere.