Greenhouse gas emissions / C.A.M. de Klein, C. Pinares-Patino and G.C. Waghorn -- Impacts of pastoral grazing on soil quality / S.P. Cuttle -- Land-water interactions: impacts on the aquatic environment / R.J. Wilcock -- Socioeconomic issues in pasture-based farming / D. Bewsell and C. Dake -- Impact of livestock grazing on extensively-managed grazing lands / W.H. Schacht and P.E. Reece -- Environmental effects of sheep farming / J.T. Scott and F.A. Robertson -- Pressures on beef grazing in mixed production farming / A.N. Sharpley and C. West -- The environmental impacts of non-irrigated, pasture-based dairy farming / R.M. Monaghan -- Impacts of irrigated dairying on the environment / D. Nash and K. Barlow -- The impact of hybrid-dairy systems on air, soil and water quality: focus on nitrogen and phosphorus cycling / P.J.A. Kleinman and K. Soder