A new World Bank report entitled ‘Turn Down The Heat: Why a 4°C Warmer World Must be Avoided’, detailing how global warming could affect sub-Saharan Africa and South and Southeast Asia shows “the likely impacts of present day two-degree and four-degree-Celsius warming on agricultural production, water resources, and coastal vulnerability for affected populations.” [http://www.worldbank.org/en/topic/climatechange]
South Asia with a population expected to at 2.2b by 2050 is at a particularly high risk. Here is one example – ““With a temperature increase of two to 2.5 degrees Celsius compared to pre-industrial levels, by the 2050s reduced water availability for agricultural production may result in more than 63 million people no longer being able to meet their caloric demand by production in the river basins (of the Indus, Ganges, and Brahmaputra),”.
Read more at http://www.ipsnews.net/2013/06/climate-change-to-determine-economic-growth/