It is not rocket science to conclude that as the century progresses there will be a glaring need for more farms and more farmers to feed the planet's burgeoning population. Meanwhile, major countries like China are buying farmland in whatever country they can find it, and food stocks on Wall Street such as ConAgra and General Mills are soaring. Access to supplies like water and grain will become major concerns to countries with diminished rainfall. By 2020, warns Chatham House in its Resources Futures report, "yields from rain-fed agriculture could be reduced by 50 percent in some areas. The highest rates of loss are expected to be in Africa, where reliance on rain-fed farming is greatest, but agriculture in China, India, Pakistan and Central Asia is also likely to be severely affected." Heat waves will diminish the flow of rivers, which will mean diminishing supplies of water for irrigation and hydroelectric power. Long range, in addition to setting waves of population migration in motion, a changed environment in the future will transform infrastructures of government out of recognition from their older patterns.