Quantcast
Insights
Glen Canyon Dam in Arizona.

Dams Cause Climate Change, They Are Not Clean Energy

People believe hydroelectric dams provide clean energy. It's not true.


I don't blame the public or the media for making this false claim—I've heard it come out of the mouth of the biggest dam operator in the Southwest U.S. (see CRWUA presentation, Dec. 2013, slide 13), and the media often repeats it (see E&E article June 30). Unfortunately, it was further repeated in a horribly misguided “study" put out by the U.S. Dept of Energy in April.

Glen Canyon Dam in Arizona.

But when I heard it quoted three months ago in this May 12 New Yorker story out of the mouth of Mark Tercek who is CEO of The Nature Conservancy to rationalize his organization's support of new dams in Columbia, I knew it's time to once-again address this disastrous myth.

Tercek is quoted as saying: “Environmentalists generally hate dams, even though they're clean energy."

Dams are not “clean energy." Dams are, in fact, causing climate change. A growing body of science is studying just how bad dams are. Here are the issues:

  • Organic material—vegetation, sediment and soil—flows from rivers into reservoirs and decomposes emitting methane and carbon dioxide into the water and then the air throughout the hydro-electric generation cycle. Studies indicate that where organic material is the highest (in the tropics or in high sediment areas) hydro-electric dams can actually emit more greenhouse gases than coal-fired powerplants. (See this report from International Rivers, this peer-reviewed article reported in Science Daily, this news report on Nature World News and this report about the Belo Monte dam). These methane emissions are not limited to tropical areas; they occur in the U.S. too. “Methane springs" are widely reported on the mud flats of Lake Powell which is a reservoir behind Glen Canyon Dam on the Colorado River (Living Rivers, slide 41), and “trains" of “methane bubbles" have been reported floating on Lake Powell (High Country News, page 5, May 17, 2011). As far back as 1948, the U.S. Geological Survey examined what they then called “gas pits" in the mud flats of Lake Mead which is a reservoir behind Hoover Dam on the Colorado River (USGS, page 162 and 180). As a real conversation ender, Brazil's National Institute of Space Research estimates that “dams are the largest single [human-caused] source of methane, being responsible for 23 percent of all methane emissions due to human activities."
  • Large dams contain enormous amounts of cement which during the construction process uses massive amounts of energy that emits greenhouse gas emissions. For one medium-sized dam project proposed for the Cache la Poudre River in Colorado, it is estimated that the construction would emit 218,000 metric tons CO2-equivalents which equals the emissions from almost 46,000 automobiles on the road for one year. Larger dams, such as Hoover Dam which contains 4.36 million cubic yards of concrete, would have exponentially higher climate change impacts from construction. The largest hydro-electric dam on the planet—the Three Gorges Dam in China—contains 27.15 million cubic meters of cement.
  • Dams that divert water out of rivers may have significant additional climate change impacts because they drain and dry up downstream wetlands that are “carbon sinks" holding vast amounts of greenhouse gases in soils. This draining and dry-up causes carbon and methane to be released and emitted into the air. A proposal for a dam on the Cache la Poudre River in Colorado would dry up 1,700 acres of wetlands thus emitting about 7,000 metric tons of CO2 equivalents. As just one more example, when the Colorado River was diverted and drained, the dams and diversions dried up about 2 million acres of wetlands in the former Colorado River Delta—the climate change impact of destroying those wetlands was likely staggering.
  • Some dams, like the proposed massive ecosystem-wide Belo Monte dams on the Amazon River in Brazil, also include massive deforestation plans on areas that will be flooded by behind the reservoirs. The deforestation itself would release enormous amounts of greenhouse gas emissions.

Read page 1

“Methane springs" are widely reported on the mud flats of Lake Powell which is a reservoir behind Glen Canyon Dam on the Colorado River and “trains" of “methane bubbles" have been reported floating on Lake Powell.

Just how much of climate change is caused by dams and reservoirs is not completely known—we need more research before we build any more dams and potentially make a terrible mistake based on myths, propaganda and false information.

Some hydro-electric dams and reservoirs are not as bad as others—some may be worse climate change emitters than coal power plants, most are likely better (see report from International Rivers). But, most hydro-electric dams are likely much worse climate change emitters than wind or solar power, so saying that hydro-electric is better than coal power is just a straw-man argument unsupported by the science and economics of 21st century renewable energy. Increasingly, wind and solar is cheaper, faster and cleaner.

Deforestation at the Belo Monte Dam in the Amazon.

Further, many dams and reservoirs are not hydro-electric plants at all and are only used for water storage and diversion, in which case they absolutely increase climate change emissions when they're built and every single day they continue to exist.

Dams are not clean energy and everyone involved with dams and energy—hydro-plant operators, media, government officials and environmentalists—must stop saying it.

Dams cause climate change. Period.

YOU ALSO MIGHT LIKE

DamNation Explores History of Dams and Brilliance of Rivers Reborn

Women Without Borders, Patagonia Without Dams

10 Things You Should Know About Dams

Show Comments ()

EcoWatch Daily Newsletter

Sponsored
Popular
Kodachrome25 / Getty Images

Roof-to-Garden: How to Irrigate with Rainwater

By Brian Barth

The average American household uses about 320 gallons of water per day, a third for irrigation and other outdoor uses. Collecting the water flowing down your downspouts in rainstorms so you can use it to irrigate in dry periods is often touted as a simple way to cut back. But setting up a functional rainwater irrigation system—beyond the ubiquitous 55-gallon barrels under the downspout, which won't irrigate much more than a flower bed or two—is a fairly complicated DIY project.

Keep reading... Show less
Health
A family wears face masks as they walk through the smoke filled streets after the Thomas wildfire swept through Ventura, California on Dec. 6, 2017. MARK RALSTON / AFP / Getty Images

How to Protect Your Children From Wildfire Smoke

By Cecilia Sierra-Heredia

We're very careful about what our kids eat, but what about the air they breathe?

Keep reading... Show less
Health
Hero Images / Getty Images

Study: Children Have Better Nutrition When They Live Near Forests

Spending time in nature is known to boost mental and emotional health. Now, a new global study has found that children in 27 developing nations tend to have more diverse diets and better nutrition when they live near forests.

The paper, published Wednesday in Science Advances, provides evidence that forest conservation can be an important tool in promoting better nutrition in developing countries, rather than clear-cutting forests for more farmland.

Keep reading... Show less
Health
Navy torpedo bomber spraying DDT just above the trees in Goldendale, WA in 1962. USDA Forest Service

Maternal DDT Exposure Linked to Increased Autism Risk

A study published in the American Journal of Psychiatry Thursday found that mothers exposed to the banned pesticide DDT were nearly one-third more likely to have children who developed autism, Environmental Health News reported.

Keep reading... Show less
Sponsored
GMO
Significant cupping of leaves from dicamba drift on non-Xtend soybeans planted next to Xtend beans in research plots at the Ashland Bottoms farm near Manhattan, KS. Dallas Peterson, K-State Research and Extension / CC BY 2.0

Top Seed Companies Urge EPA to Limit Dicamba

Two of the nation's largest independent seed sellers, Beck's Hybrids and Stine Seed, are urging the U.S. Environmental Protection Agency (EPA) to place limits on the spraying of the drift-prone pesticide dicamba, Reuters reported.

This could potentially hurt Monsanto, which along with DowDupont and BASF SE, makes dicamba formulations to use on Monsanto's Xtend seeds that are genetically engineered to resist applications of the weedkiller. Beck's Hybrids and Stine Seed, as well as other companies, sell those seeds.

Keep reading... Show less
Food
Baby son in high chair feeding father. Getty Images

Baby Food Tests Find 68 Percent Contain 'Worrisome' Levels of Heavy Metals

Testing published by Consumer Reports (CR) Thursday found "concerning levels" of toxic metals in popular U.S. baby and toddler food.

The consumer advocacy group tested 50 nationally-distributed, packaged foods designed for toddlers and babies for mercury, cadmium, arsenic and lead.

Keep reading... Show less
Sponsored
Popular
Interior Secretary Ryan Zinke talks to journalists outside the White House West Wing before attending a Trump cabinet meeting on Aug. 16. Chip Somodevilla / Getty Images

Zinke Announces Plan to Fight Wildfires With More Logging

The Trump administration announced a new plan Thursday to fight ongoing wildfires with more logging, and with no mention of additional funding or climate change.

Keep reading... Show less
Energy
Wangan and Jagalingou cultural leader Adrian Burragubba visits Doongmabulla Springs in Australia. The Wangan and Jagalingou are fighting a proposed coal mine that would likely destroy the springs, which are sacred to the Indigenous Australian group. Wangan and Jagalingou

Indigenous Australians Take Fight Against Giant Coal Mine to the United Nations

By Noni Austin

For tens of thousands of years, the Wangan and Jagalingou people have lived in the flat arid lands of central Queensland, Australia. But now they are fighting for their very existence. Earlier this month, they took their fight to the United Nations after years of Australia's failure to protect their fundamental human rights.

Keep reading... Show less
Sponsored

mail-copy

The best of EcoWatch, right in your inbox. Sign up for our email newsletter!