Air pollutants Air pollution Air quality Aquatic Biology and Ecology Aquatic environment Beef cattle Cattle Cycling Dairy farming Emission Environmental impact Grasslands Grasslands and Rangelands Grazing Greenhouse gases Irrigation Meteorology and Climate Nitrogen cycle Pastures Phosphorus Polluted soils Polluted water Pollution and Degradation Sheep Sheep farming Social Psychology and Social Anthropology, (New March 2000) Socioeconomics Soil Chemistry and Mineralogy Soil Fertility Soil fertility