Acidification, Biological diversity
CO2, CO 2, global warming, climate change, greenhouse effect, greenhouse effect gases, emisiones de gases de efecto invernadero, carbon dioxide
Energy consumption, Climatic changes, Energy conservation, Prevention, Estudio y enseñanza
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