Comment on: Lloyd (2010) Historical trends in the flows of the Breede River (Water SA 36 (3) 329-333)

Philip Lloyd makes some useful points in this publication relating to recent changes in Berg River flow, but one key conclusion goes far beyond what can be claimed based on his analyses and discussion. While it is important to validate and criticize the published work of other authors, as he does in this paper, it is also important not to use this as a platform to develop unjustified overarching criticisms of a broader field of study and its policy value. I would like to draw attention to one important omission in his background discussion of General Circulation Models (GCMs), and then question his final conclusion.