Electric or hydrogen as drivers for climate-neutral mobility? Among others. agriportance, however, focuses on the alternative fuel biomethane for a variety of reasons. Biomethane is produced from organic residues, liquid manure or dung. Farmers process biomethane from the biogas of a biogas plant, which consists of about 60 % of methane and 40 % of CO2. In the biomethane upgrading process, CO2 is split off. In the ...