Global Boom in Hydropower Poses Serious Threat to the Planet
Hydropower, the renewable technology that sets gravity to work and harnesses the energy of rivers, is about to double its output.
Photo credit: Dan Kamminga via Wikimedia Commons
The growth will be mostly in the developing world—but the construction of new dams on rivers in South America, South-east Asia and Africa comes at a cost. Around a fifth of the world’s largest remaining free-flowing rivers will be dammed, which presents yet another threat to the wild things that live in or depend on wild water.
Christiane Zarfl—now assistant professor for Environmental System Analysis at the University of Tübingen, Germany—and former colleagues at the Leibniz Institute of Freshwater Ecology and Inland Fisheries in Berlin presented their findings at the International Alliance of Research Universities congress on global challenges, hosted by the University of Copenhagen. The research is also published in the journal Aquatic Sciences.
Renewables, such as solar energy and wind power, now provide about a fifth of the world’s electricity production, and hydroelectric power makes up four-fifths of that. The researchers believe that, within the next two decades, another 3,700 dams may more than double hydropower’s total electricity capacity to 1,700 gigawatts.
Surge of activity
China will remain the global leader, but because of the surge of activity in other countries, its share will fall from 31 percent to about 25 percent. The largest number of new dams in South America will be in the Amazon and La Plata basins of Brazil. In Asia, the biggest effort will be in the Ganges-Brahmaputra basin and along the Yangtze.
But while some national economies look for a brighter electric future from hydropower, others have to confront and come to terms with the capriciousness of freshwater delivery.
Professor Jim Hall, Director of the Environmental Change Institute at the University of Oxford, and colleagues argue in Science magazine that too much water—as well as too little—can seriously damage a nation’s economic health. And climate change means that this unpredictability is likely to present even greater difficulties in the decades ahead.
But challenges exist already. In Ethiopia, a sustained drought has reduced economic growth by 38 percent. In Thailand, floods in 2011 cost the country $16 billion in insured losses and $43 billion in overall economic losses. In parts of India, half the annual rainfall splashes onto the dusty soils in just 15 days, and 90 percent of the annual river flows are concentrated into about four months of the year.
Rainfall can vary according to season and from year to year. Climate scientists have also repeatedly warned of a possible increase in extremes of heat and flood. So there are at least three dimensions to the delivery of water on tap.
In the arid regions—and these include most of Australia, the southwestern U.S., the Middle East and North Africa—conditions are marked by what hydrologists call “strong interannual variability,” which is a delicate way of saying that droughts can last for years and then end suddenly with catastrophic flash floods.
“When these dimensions are combined,” the report’s authors say, “the situation is most challenging—a wicked combination of hydrology that confronts the world’s poorest people.”
YOU MIGHT ALSO LIKE
To save the planet, we must save the Amazon rainforest. To save the rainforest, we must save its indigenous peoples. And to do that, we must demarcate their land.
A new EarthxTV film special calls for the protection of the Amazon rainforest and the indigenous people that call it home. EarthxTV.org
- Meet the 'Women Warriors' Protecting the Amazon Forest - EcoWatch ›
- Indigenous Tribes Are Using Drones to Protect the Amazon ... ›
- Amazon Rainforest Will Collapse by 2064, New Study Predicts ... ›
- Deforestation in Amazon Skyrockets to 12-Year High Under Bolsonaro ›
- Amazon Rainforest on the Brink of Turning Into a Net Carbon Emitter ... ›
EcoWatch Daily Newsletter
By Anke Rasper
"Today's interim report from the UNFCCC is a red alert for our planet," said UN Secretary General Antonio Guterres.
The report, released Friday, looks at the national climate efforts of 75 states that have already submitted their updated "nationally determined contributions," or NDCs. The countries included in the report are responsible for about 30% of the world's global greenhouse gas emissions.
- World Leaders Fall Short of Meeting Paris Agreement Goal - EcoWatch ›
- UN Climate Change Conference COP26 Delayed to November ... ›
- 5 Years After Paris: How Countries' Climate Policies Match up to ... ›
- Biden Win Puts World 'Within Striking Distance' of 1.5 C Paris Goal ... ›
- Biden Reaffirms Commitment to Rejoining Paris Agreement ... ›
India's New Delhi has been called the "world air pollution capital" for its high concentrations of particulate matter that make it harder for its residents to breathe and see. But one thing has puzzled scientists, according to The Guardian. Why does New Delhi see more blinding smogs than other polluted Asian cities, such as Beijing?
- This Indian Startup Turns Polluted Air Into Climate-Friendly Tiles ... ›
- How to Win the Fight Against Plastic - EcoWatch ›
In a historic move, the Delaware River Basin Commission (DRBC) voted Thursday to ban hydraulic fracking in the region. The ban was supported by all four basin states — New Jersey, Delaware, Pennsylvania and New York — putting a permanent end to hydraulic fracking for natural gas along the 13,539-square-mile basin, The Philadelphia Inquirer reported.
- Appalachian Fracking Boom Was a Jobs Bust, Finds New Report ... ›
- Long-Awaited EPA Study Says Fracking Pollutes Drinking Water ... ›
- Pennsylvania Fracking Water Contamination Much Higher Than ... ›
Colombia is one of the world's largest producers of coffee, and yet also one of the most economically disadvantaged. According to research by the national statistic center DANE, 35% of the population in Columbia lives in monetary poverty, compared to an estimated 11% in the U.S., according to census data. This has led to a housing insecurity issue throughout the country, one which construction company Woodpecker is working hard to solve.
- Kenyan Engineer Recycles Plastic Into Bricks Stronger Than ... ›
- Could IKEA's New Tiny House Help Fight the Climate Crisis ... ›