The Water-Energy-Food Nexus: Interlinked Solutions For Interlinked Challenges
We can't prevent global shortages of drinking water while providing enough food and energy to meet the needs of a growing population in a climate-constrained world if we don't understand the linkages between water, energy and food security. Here’s a look at how our demands for energy, food and water all drive each other, and how we can prevent them from driving in the wrong direction.
About this Series
Energy, food and water are inextricably linked, and these linkages will concentrate stress as the world’s population grows in both wealth and numbers. Water is required in almost all forms of energy production, while energy is often used to treat or transport water, and both energy and water are required in food production. Their interdependence is most commonly referred to as the water energy food nexus, although the concept is so multifaceted other elements like climate and land are often inserted in. Nexus thinking means using integrated and holistic approaches to solving supposedly separate challenges.
Ecosystem Marketplace is launching a series of stories leading up to the State of Watershed Payments 2014 report release date that looks at global challenges related to the nexus and the various approaches businesses, government and the world as a whole are taking to address this issue. This is the second in the series.
Part One US Chamber Of Commerce Aims To Promote Food Security Through Sustainable Management Of Water And Energy explores private sector initiatives that have addressed the water-energy nexus successfully.
Part Two:The Water-Energy-Food Nexus: Interlinked Solutions For Interlinked Challenges offers an introduction to the water-energy-food nexus using global examples and explanations of the nexus' many facets.
11 June 2014 |
India is one of the world's biggest users of groundwater, but the aquifers that store much of its freshwater are overused, slow to replenish and rapidly depleting. That's because the country's rapidly-expanding middle class has boosted its farms, which are stretching its water resources beyond capacity. The same thing is happening in energy, which uses water for cooling thermal power plants. If India doesn’t address its water challenges, it won’t be able to support its growth in both the food and energy sector – and thus its evolution as a nation.
And the country is far from alone. In China, where water distribution is woefully imbalanced, the dry desert-like north contains most of the croplands but only 16% of the freshwater. Natural resources are constrained throughout the nation, and the extraction activities that do take place have a big impact on groundwater and other water sources by significantly depleting them. Energy development often competes with the agriculture sector for water use.
Likewise in the United States, large-scale agriculture projects in California earn billions of dollars but also require enormous amounts of water – which, in a place like California, is in short supply. And demands for energy development factor in here, too – with different forms of energy extraction underway across the state, including hydraulic fracturing (fracking)
– the natural gas extraction practice that pumps millions of gallons of water, sand and other chemicals into the ground to bust open shale formations to access the energy source inside.
Each of these regions – and, indeed, every part of the world – are caught in the “water-energy-food-nexus”. And because the challenges are becoming increasingly interdependent, integrated solutions that involve cross sector collaboration must be adopted. The concept is complex, but at its core, the nexus focuses on natural resource scarcity and management.
Understanding the Nexus
Ultimately, “nexus thinking” means implementing integrated solutions at an ecosystem or landscape level that enhance security and sustainability in all three sectors.
The food sector part of the nexus is perhaps the simplest to comprehend. Water and energy are both needed to produce food, and agriculture consumes 80% of water resources. As populations and prosperity increase in places like India and China, people will demand more meat, which means a greater demand for corn and soybeans to feed animals. Some argue we’ll see a self-correction as the system implodes, taking with it populations and prosperity, but that’s not a solution – it’s a tragedy.
The interdependence between water and energy is more complex, and we might as well start in California.
The state uses 20% of its electricity to pump, treat and deliver water via the world's largest public power development and water delivery system, The California State Water Project
, which supplies 23 million people in California's water scarce but populous southern region with drinking water. This involves miles of pipelines, tunnels and canals and includes carrying water 2,000 feet over the Tehachapi Mountains. It's the largest single user of energy in the state.
Then you have the fact that water is required in basically all forms of energy, and often energy development takes place in areas where water is scarce. Staying in California, we see this in Kern County, where much of the state's agriculture growth is taking place also. The county has always been a big energy developer containing some of the top producing oil fields in the United States. Now fracking is is in the mix, too, and it consumes roughly 164,000 gallons of water per fracking well. This is common throughout the US. According to a Ceres report
, nearly half of all fracking activities happen in water-stressed regions.
But coal is even worse. In a year, a typical coal plant can withdraw up to 180 billion gallons of water and consume up to 4 billion gallons
. A 2013 report
from the Union of Concerned Scientists (UCS) projected that water withdrawals would decrease by 80% and consumption by 40% if natural gas supplies 60% of the US' power. This would hardly solve global water and energy challenges, however, because natural gas extraction is still water-intensive and happening in water stressed regions.
Implications of the Nexus
These events unfolding around the world carry implications for the business-as-usual practices of global companies. And similar to how India's usage of its groundwater is unsustainable, the current practices of most companies aren't sustainable either. The changing dynamics of water, energy and food affect business operations thoroughly. A change in price or availability, for example, in one of these commodities impacts a business from its factory floor to its corporate offices.
A recent study
found that 60% of the companies surveyed indicated water would negatively affect profitability and growth within the next five years. 80% of respondents said the resource will affect where companies' locate facilities.
The drought that took hold of Texas in 2011 directly contributed to shuttered operations – like a meat processing plant in Plainview – and job loss. It also prevented growth of the power sector despite significant demand for it in the state. There wasn't enough water available to ensure steady production of electricity. This instability in the energy sector prevented major businesses
from locating there.
The water shortages that businesses in Texas struggle with are just one challenge companies face regarding the nexus. Businesses often share water sources with other actors outside of the sector like farmers and local residents. And with multiple users often drawing from the same water source, what one does impacts the other. Fertilizers from farming activities that pollute a watershed can render it unusable for other actions. Realizing that natural resources are shared can encourage competing demands to address the matter holistically at a landscape level.
A landscape approach to the nexus also carries social implications for the local populations and perhaps beyond. Because ecologically friendly farming practices, for example, that preserve a source of clean water for all users also provides sustainable livelihoods for local populations.
This potential sustainability is another aspect of the nexus. Nexus thinking can provide stability and promote political and economic security for societies while poor resource management can generate quite the opposite. Disagreements over water management in water-scarce regions like the Middle East
has led to conflicts between neighbors. In North Africa, for instance, Ethiopia is aiming for energy self-sufficiency with construction of the continent's largest hydroelectric dam on the Nile River. But the river is essentially a source of life for Egyptians-83 million people rely on it for almost all of their water needs. Egyptian officials claim the nation will lose 20-30% of its Nile water
and nearly a third of power generated from its own hydroelectric dam. Ethiopia hopes to finish the project by 2017 but in the meantime, relations between the two nations have soured. Egypt even threatens military action if construction of the dam isn't stopped.
This situation isn't new. Still within the Middle East, Iraq lost its once ample supply of freshwater flowing from the Tigris and Euphrates Rivers to Turkey when it constructed dams upstream.
The Middle East isn't the only region trying to grow its energy capacity. Other emerging economies in Africa and Asia are doing the same. Demand for energy is expected to rise 70% by 2035, according to a UN report
on world water and energy. And while bringing electricity to the 1.3 billion people who lack it is a positive, the report says, the water required in the process isn't valued economically so its limitations are ignored. Sources are stressed and depleted. The report also predicts an increase in water resource-related conflicts unless integrated-or at least more innovative-approaches are adopted.
Nature and the Nexus
With the political, social and economic implications of the water-energy-food nexus, it's easy to overlook the nexus' natural component. The nexus is part of nature. Each sector requires healthy ecosystems in order to function sustainably. Ecosystem services
that purify water and mitigate scarcity ease the severity of droughts and floods and make food and energy production more reliable. Incorporating nature into the nexus means integrating natural infrastructure like mangroves and coral reefs, which protect coastal regions from hurricanes, into nexus management. Other examples of natural infrastructure that would benefit water, energy and food security include wetlands and floodplains that lower flood peaks and forests that filter and store water.
by The Nature Conservancy (TNC) and the International Union for the Conservation of Nature encourages the integration of nature into infrastructure investment creating a mixed portfolio of both natural and grey infrastructure that complements each other. The report notes a combined system of green and grey solutions would deliver the best results in terms of cost-effectiveness, risk and sustainable development.
To demonstrate how well natural infrastructure can work, there is the now famous example
of New York City conserving the forests and wetlands of Catskill watersheds in order to maintain water quality and ensure a clean drinking water supply for NYC residents.
Likewise, ignoring natural infrastructure and relying completely on engineered systems often results in unhealthy ecosystems with a low productivity rate of ecosystem services. Dams built in Nigeria's Komadugu Yobe Basin affected the flow of water downstream reducing the flooding season farmers relied on to water their crops. Invasive weeds flourished choking waterways and ruining pastoral and agricultural lands and fisheries. The dams were built to store water for agriculture and drinking purposes but investment in the project didn't materialize leaving ecosystems degraded and a population vulnerable to food insecurity.
Solutions to Nexus Challenges
Integrating natural infrastructure into management of the nexus is one solution that can have a big impact on the sustainability of all three sectors.
Answers to the nexus challenge rely on efficiency and cross-sector collaboration at a landscape-level. Solutions using a framework that encompasses these elements are being considered and implemented throughout the world.
In terms of efficiency, there have been solid attempts in all three sectors to increase its levels. Referring again to the UCS report on US power production, the study highlights the importance of transitioning development toward more efficient water-smart techniques. If the US were to follow a trajectory of water-smart power development, water withdrawals would decline by 97% by 2050 and consumption would be reduced by 85%-not to mention power sector carbon emissions would drop 90% below current levels. The technology and resources are available for this transition to happen.
These water-smart techniques the UCS is supporting include renewable energy. India, struggling with its overworked power grid, is also exploring renewables as one way to relieve some of the strain and increase efficiency. The government is looking to swap groundwater pumps powered by diesel fuel and the outdated power system with solar water pumps. Farmers receive subsidies to buy the solar pumps and in exchange agree to practice water-saving drip irrigation.
Not only does the initiative in India mean less water used for energy, it could also mean less water for producing food. Efficiency in producing food is a necessary component of nexus solutions. Reducing waste and growing more food on already cultivated land are two of the steps National Geographic lays out for feeding Earth's rising population. An entire step focuses on efficient resource use highlighting techniques like cover crops, mulching and composting, that build up nutrients in the soil and conserve water. Innovative technology grows in the food sector as well. Computerized tractors with GPS allow farmers to better target the application of fertilizers and pesticides minimizing runoff into nearby waterways.
The private sector is also heavily involved in the spread of efficient and innovative solutions
. The rising interest in natural capital among businesses is helping to guide nexus thinking along as more companies become aware of their dependence and risks regarding the natural world and begin to take action. Big companies like AT&T and Hershey are making changes-upgrading outdated cooling systems and investing in conservation technology.
There is a gradual increase in companies addressing the nexus and managing their water risk
. A recent report
found that one in four watershed investment projects
counted a business as a financial supporter. Companies are in partnerships with NGOs and governments over watershed protection and restoration activities, which address challenges on a large scale.
But further collaboration on this large scale level is needed in order to truly address and change the way society addresses its water use and energy and food production. And while change is often slow to happen, initial steps of understanding the water-energy-food nexus and coming to terms with the world's reliance on it can happen immediately.
Kelli Barrett is a freelance writer and editorial assistant at Ecosystem Marketplace. She can be reached at firstname.lastname@example.org.
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