Increasing Populations are Decreasing World Wide Water Supplies
Water is essential for human survival. It is considered a renewable resource but its limits are determined by the water cycles within a geographic location. Water availability is directly affected by population growth. There are approx. 83 million people added to the earth each year. Many of these people are born into impoverished and population dense areas, which in turn, escalates the burden on that regions surrounding water supplies. There already exist many regions in the world where population levels have surpassed what can be sustained by the local water resources. Numerous geographical regions also have high population growth rates and barring natural disaster or famine these rates are expected to escalate.
Geo-political tension is developing between nations over fresh water supplies especially from rivers. Disputes over who has water rights are becoming more prevalent as countries upriver are using increasing amounts of water for their farming or hydroelectric power generation leaving less water for those countries downriver. Even in regions or countries once considered abundant with water, problems exist due to declining water tables. This is occurring because increasing population centers are draining aquifers and ground water faster than precipitation or underground rivers can replace it. Fossilized aquifers are not replenishable, once depleted that source is gone for good. Projected demand for water has already exceeded available supplies in many regions. Those countries most affected by water shortages (developed and undeveloped) are falling behind in their attempts to seriously address this problem.
There are other issues affecting water shortages. Water is being drained out of aquatic environments (i.e. the Everglades) at an increasing rate which affects not only ecosystems but the regions ability to replenish ground water supplies. Pollution is contributing to reducing potable ground water rendering some underground sources unusable due to toxicity or increasing the filtration costs beyond economically viable levels. This is due predominantly to industrial dumping, farming, mining, landfills, etc. Developed countries have experienced some success in curtailing pollution due to regulation and new technology but the developing world with its large population growth and reduced economic resources is struggling.
Fresh water availability is what is critical to humanity as 97.5% of the earth’s water is salt water and 90% of the earth’s fresh water is frozen in Antarctica, Greenland and North Pole ice sheets. Most of the remaining fresh water is soil moisture, and very deep aquifers that would require considerable drilling costs. This leaves approximately 1% of fresh water available for human use and includes mountain glaciers, surface sources like lakes, rivers, and reservoirs, and underground shallow aquifer sources. This amount is also renewable through rain water and snowfall.
The U.S. is an example of a country that has done fairly well with fresh water conservation and increasing efficiencies in fresh water use. In 2005 the U.S. decreased fresh water consumption levels down to 349 billion gallons per day (bgal/day) or a 5% decrease over the past 25 years. Fresh water consumption of 268 bgal/day was pulled from surface sources and 79 bgal/day was removed from underground sources. Most of the rest of the world is experiencing increased demand for fresh water.
Consumption levels for fresh water in the U.S. are as follows: 41% or 143 bgal/day of all fresh water went for thermoelectric power generation; almost that entire amount was from surface sources. Farming utilized 129 bgal/day or 37 percent of freshwater. This amount has decreased 5% over the past decade due to sprinkler system and micro irrigation advances but are expected to increase again as population growth overtakes irrigation efficiencies. Farming uses also account for 67% of all the ground water extracted. Public supply is at 45 bgal/day or 13% and includes water requirements for residential homes, commercial factories, and other business needs. Industry used almost 15 bgal/day or approximately 4%. This amount is also decreasing due to efficiencies mostly in the mining sector. These figures roughly reflect worldwide demand as well.
Populations will continue to increase world wide especially in poorer developing countries with high poverty with less access to education and birth control. Farming requirements necessary to feed these increasing populations will strain existing water supplies to their limits and require developed countries to increase their farming output to help mitigate famine and starvation. This will in turn increase their water demands. Ground and surface water pollution will continue to increase especially in regions where government regulation for pollution does not keep pace industrial and economic growth.
Measures must be implemented world wide that:
- Conserve existing fresh water supplies while aligning population size to a regions water availability. This may mean establishing population growth limits in some areas regardless of religious or cultural belief systems. Another possibility is redistributing some percentage of a population to more suitable regions, but this may create ethnic rivalries.
- Create energy efficient and cost effective desalinization plants and pipeline infrastructure for large scale water distribution. This will be expensive and desalinization plants create their own set of problems beyond costs, but outside of transporting icebergs across large distances it is the only realistic solution available.
- Generate legislation in both developed and undeveloped countries that addresses and limits industrial dumping processes. Another unpopular and expensive measure that will not likely be affordable to under developed countries and require the financial assistance of developed countries.
Failure to meet these requirements will result in decreased water availability, rationing, severe water shortages with decreased food production, and enough political tension to eventually result in regional wars over water. Water is one of the basic requirements of a civilization and more than one civilization has seen its demise due to sustained drought or a long term change in the ecosystem. Problems with limiting access are already upon us and will continue to grow. Sticking our collective heads in the sand and pretending the problem doesn’t exist or that there is still plenty of time to deal with it will put society’s in a reactive, self-preservation mode which generally triggers a reaction towards war to solve the immediate crisis. My conclusion is start funding and allocating resources now for long term, sustainable solutions or pay more money later for: escalating prices for water and the inevitable costs associated with war.