Anaerobiosis, Manure, Air Pollution - prevention & control, Animals, Cattle, Dairying, Methane - analysis, Environment, Refuse Disposal - methods, Conservation of Energy Resources, Biofuels, Spain
Climate change, Agriculture, Science, Water resources, Hydrology, China, Irrigation, California, Water quality, desalination, Digestion, Salinity, Water treatment, Sweden, Anaerobic digestion, Reuse, Middle East, Sewage sludge, Water reuse, Anaerobic processes, Euphrates River, Baghdad Iraq, United States–US