“…In other words, the production and flow of cereals is very much affected biophysically by meteorological variables, including rising temperatures, changing precipitation regimes, and increased atmospheric carbon dioxide levels. Biophysical effects of climate change on production of cereals are claimed to be positive in some agricultural systems and regions, and negative in others, and these effects are claimed to vary through time (Parry et al, 2004;Harmeling et al, 2007;Alcadi et al, 2009). The negative effects are attributable to increasing temperature and decreasing precipitation (Deressa, 2007;Georgis et al, 2009;Ludi, 2009;FDRE, 2010;Ringler et al, 2010;World Bank, 2010;Gebreegziabher et al, 2011;Mekonnen, 2012;Schmidt & Tadesse, 2012;AfDB, 2013).…”