Water, Food, Population
This past year I've had my students look at water, food and population issues. When I look at US water issues I believe that water is being used at unsustainable levels in some places. So, Naked Capitalism has a post on the seriousness of water issues in California, which is a huge supplier of agricultural products, which are dependent on water access. The post is actually about residential developments being denied if the developer can't show 20 years of water supply. A big part of my interest has been to follow it in terms of how it relates to the food supply.
The US has about 10 times the population of Canada and China has more that 40 times the population density. The way I look at it is if the US is already having serious water issues, China's development will be limited by water issues.
Actually, with research I did with my students we found that something like half the population already have some water supply issues, either the water isn't particularly safe, or there is limited access to water.
This is the second story I've read this week related to serious water issues. There are serious water issues in many countries in the world.