In the mitigated scenario, the annual costs for increasing irrigation capacity are estimated to be USD 8 billion in 2030 and USD 12 to 14 billion in 2050. For climate change projections, two GCM models were used: i) Hadley and ii) CSIRO. The SRES A2 scenario was used as a proxy of unmitigated climate and SRES B1 as a proxy of partly mitigated climate.