It's a problem the managers will become more familiar with as population rises and climate change brings on more prolonged droughts. (treehugger.com)
Food security will be one of the pressing issues of the next half - century as the world's population rises by several billion. (scientificamerican.com)
As consumption accelerates everywhere and world population rises, it is no longer sufficient to work towards a distant ideal of sustainable development. (dotearth.blogs.nytimes.com)