EuroChoices just released a follow up article to the work I had previously done with Ada Ignaciuk at the OECD, looking at the potential role of increasing irrigation efficiency to adapt to climate change. This article is more focused towards policy makers in summarizing some key trade offs with irrigation management (e.g. irrigation expansion and irrigation efficiency) as a vehicle for climate adaptation. You can take a look at this new article here: http://onlinelibrary.wiley.com/doi/10.1111/1746-692X.12088/epdf.
For a more technical and detailed analysis you can also take a look at the first report that we did that was released last year. This report focused more on OECD countries, as compared to the EuroChoices article which has a more global focus. This report also looked at the effects of a couple hypothetical technologies to provide context to the relative improvement due to better irrigation management. You can download the report from the OECD at: http://www.oecd-ilibrary.org/agriculture-and-food/modelling-adaptation-to-climate-change-in-agriculture_5jxrclljnbxq-en