We live in a world of dangerous, deadly extremes.Record-breaking heat waves, intense drought, stronger hurricanes, unprecedented flash flooding. No corner of the planet will be spared the wrath of human-caused climate change and the earth’s fresh water is already feeling the heat of this new reality. More than half of the world’s lakes and two-thirds of its rivers are drying up, threatening ecosystems, farmland, and drinking water supplies. Such diminishing resources are also likely to lead to conflict and even, potentially, all-out war.
“Competition over limited water resources is one of the main concerns for the coming decades,” warned a study published in Global Environmental Change in 2018. “Although water issues alone have not been the sole trigger for warfare in the past, tensions over freshwater management and use represent one of the main concerns in political relations between… states and may exacerbate existing tensions, increase regional instability and social unrest.”
The situation is beyond dire. In 2023, it was estimated that upwards of three billion people, or more than 37% of humanity, faced real water shortages, a crisis predicted to dramatically worsen in the decades to come. Consider it ironic then that, as water is disappearing, huge dams — more than 3,000 of them — that require significant river flow to operate are now being built at an unprecedented pace globally. Moreover, 500 dams are being constructed in legally protected areas like national parks and wildlife reserves. There was a justification for this, claimed the U.N.’s Intergovernmental Panel on Climate Change (IPCC) some years ago. Such projects, it believed, would help battle climate change by curbing carbon dioxide emissions while bringing electricity to those in the greatest of need.
“[Hydropower] remains the largest source of renewable energy in the electricity sector,” the IPCC wrote in 2018. “Evidence suggests that relatively high levels of deployment over the next 20 years are feasible, and hydropower should remain an attractive renewable energy source within the context of global [greenhouse gas] mitigation scenarios.”
The IPCC acknowledged that unceasing droughts impact stream flow and that climate change is unpredictably worsening matters. Yet its climate experts still contended that hydropower could be a crucial part of the world’s energy transition, arguing that an electric dam will produce seemingly endless energy. At the same time, other renewable sources like wind and solar power have their weather- and sunlight-bound limitations.
Well-intentioned as it may have been, it’s now far clearer that there is a crack in the IPCC’s appraisal. For one thing, recent research suggests that hydro-powered dams can create an alarming amount of climate-altering greenhouse gas emissions. Rotting vegetation at the bottom of such reservoirs, especially in warmer climates (as in much of Africa), releases significant amounts of methane, a devastating greenhouse gas, into the atmosphere.
“Most of this vegetation would have rotted anyway, of course. But, without reservoirs, the decomposition would occur mostly in the atmosphere or in well-oxygenated rivers or lakes,” explains Fred Pearce in the Independent. “The presence of oxygen would ensure the carbon in the plants formed carbon dioxide. But many reservoirs, particularly in the tropics, contain little oxygen. Under those anaerobic conditions, rotting vegetation generates methane instead.”
While CO2 also seriously harms the climate, methane emissions are far worse in the short term.
“We estimate that dams emit around 25% more methane by unit of surface than previously estimated,” says Bridget Deemer of the School of Environment at Washington State University in Vancouver, lead author of a highly-cited study on greenhouse gas emissions from reservoirs. “Methane stays in the atmosphere for only around a decade, while CO2 stays several centuries, but over the course of 20 years, methane contributes almost three times more to global warming than CO2.”
And that’s hardly the only problem dams face in the twenty-first century. At the moment, Chinese financing is the most significant global driver of new hydropower construction. China has invested in the creation of at least 330 dams in 74 countries. Each project poses its own set of environmental quandaries. But above all, the heating of the planet — last year was the warmest in human history and January 2024 the hottest January on record — is making many of those investments look increasingly dubious. On this ever-hotter globe of ours, for instance, a drought in Ecuador has all too typically impacted the functionality of the Amaluza Dam on the Paute River, which provides 60% of that country’s electricity. Paute was running at 40% capacity recently as its river flow dwindled. Similarly, in southern Africa, water levels at the Kariba Dam’s reservoir, located between Zambia and Zimbabwe, have fluctuated drastically, impairing its ability to produce consistent energy. “In recent years, drought intensified by climate change has caused reservoirs on all five continents to drop below levels needed to maintain hydroelectric production,” writes Jacques Leslie in Yale E360, “and the problem is bound to worsen as climate change deepens.”
Even in the United States, the viability of hydropower is an increasing concern. The Hoover Dam on the Colorado River, for example, has been impacted by years of drought. Water levels at its reservoir, Lake Mead, continue to plummet, raising fears that its days are numbered.
The same is true for the Glen Canyon Dam, which also holds back the Colorado, forming Lake Powell. As the Colorado dries up, Glen Canyon may also lose its ability to produce electricity.
Driven by dwindling water resources, the global hydropower crisis has become a flashpoint in the far reaches of Northern Africa, where the creation of a giant dam could very well lead to a regional war and worse.
The lifeblood of northeastern Africa, the Nile River, flows through 11 countries before emptying into the Mediterranean Sea. Measured at 6,650 kilometers, the Nile may be the longest river on Earth. For millennia, its meandering waters, which run through lush jungles and dry deserts, have been irrigating farmlands and providing drinking water for millions of people. Nearly 95% of Egypt’s 109 million people live within a few kilometers of the Nile. Arguably the most important natural resource in Africa, it’s now at the epicenter of a geopolitical dispute between Egypt, Ethiopia, and Sudan that’s brought those countries to the brink of military conflict.
A major dam being built along the Blue Nile, the river’s main tributary, is upending the status quo in the region, where Egypt has long been the preeminent nation. The Grand Ethiopian Renaissance Dam (GERD for short) is to become one of the largest hydroelectric dams ever constructed, stretching more than 1,700 meters and standing 145 meters tall, a monument many will love and others despise.
There’s no question that Ethiopia needs the electricity GERD will produce. Nearly 45% of all Ethiopians lack regular power and GERD promises to produce upwards of 5.15 gigawatts of electricity. To put that in perspective, a single gigawatt would power 876,000 households annually in the United States. Construction on the dam, which began in 2011, was 90% complete by last August when it began producing power. In total, GERD’s cost is expected to eclipse $5 billion, making it the largest infrastructure project Ethiopia has ever undertaken and the largest dam on the African continent.
Joshua Frank is the managing editor of CounterPunch.
Source: CounterPunch
