Tuesday, November 17, 2015

U.S. Thirst for Oil Straining International Water Supplies

An oil well in West Texas. (Credit: four12/flickr) Click to Enlarge.
Rising energy demand is straining freshwater supplies globally, especially in the developing world, and U.S. oil demand is disproportionately responsible for that strain, a new study says.

Global freshwater resources are a critical climate issue because global warming could threaten drinking water supplies for billions of people worldwide, as droughts become more severe, seas rise and precipitation patterns change across the globe.

Fossil fuel production is a major freshwater consumer.  In the U.S., for example, most new oil and gas wells use millions of gallons of water each.  Much oil and gas development is taking place in drought-stricken and arid regions suffering from water scarcity like the Colorado River Basin, a major source of water for Los Angeles, Phoenix and Las Vegas.

The study by the University of Southampton in the UK, published Monday in the Proceedings of the National Academy of Sciences, found that petroleum is responsible for most of the global demand for water when it comes to energy production.

About 56 percent of all the petroleum sector’s freshwater consumption is international, straining other countries’ water supplies.  In other words, oil the U.S. imports from the arid Middle East strains the freshwater supplies of Saudi Arabia and other countries, outsourcing not just oil production but water stress as well.

In comparison, water used to meet each country’s demand for electricity and natural gas comes from mostly local sources with less than 20 percent of the water needs of most countries’ electric and gas sectors coming from across borders.  

Half of global oil demand for water comes from the U.S., China and India, but the two biggest oil consumers — the U.S. and China — affect water supplies in wildly different ways even though their oil sectors use about the same amount of water.

About 73 percent of U.S. oil’s water needs come from international sources — three times that of China, where 22 percent of its oil sector’s water consumption occurs internationally.  Most of the U.S. petroleum sector’s water demand occurs in highly arid countries, mostly western and southern Asia — the sources of most U.S. oil imports.

“The core message of this study is that identifying the best options for future energy systems must take into account not only greenhouse gas emissions but the other environmental, social and economic implications of any choices that we make,” study co-author Robert Holland, a postdoctoral research fellow in the Centre for Biological Sciences at the University of Southampton, said. “Such analysis must also consider not only the implications in the country where energy demand resides, but must also consider the role of international trade in driving pressures on the world’s resources.”
“Given (climate change-related) predictions about changes in rainfall patterns and associated freshwater resources over the coming decades, our study suggests that a real focus of future energy policy must be on both strategies to curb greenhouse gas emissions while doing so in a way that considers the implications for freshwater resources,” Holland said.  “The goals of both energy and water security are inextricably linked.”

Read more at U.S. Thirst for Oil Straining International Water Supplies

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