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The Blue Nile river passes through the Grand Ethiopian Renaissance Dam in Ethiopia on December 26, 2019. EDUARDO SOTERAS / AFP / Getty Images

By Sonya Angelica Diehn

Dams are often touted as environmentally friendly. Although they do represent a renewable source of energy, a closer look reveals that they are far from green. DW lays out the biggest environmental problems of mega-dams.

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Floodwaters flowing from the Tittabawassee River into the lower part of downtown Midland on May 20, 2020 in Midland, Michigan. Thousands of residents have been ordered to evacuate after two dams in Sanford and Edenville collapsed. Gregory Shamus / Getty Images

Around 10,000 people were forced to evacuate their homes in central Michigan after heavy rain prompted what the National Weather Service called "catastrophic failures" at two dams.

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Spider excavators remove on dam on San Juan Creek in California's Cleveland National Forest. Julie Donnell / USFS

Removing one gigantic dam can have a massive effect on restoring a river ecosystem.

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A new study raises concerns about the decline of platypus populations. UNSW Science

The devastating wildfires in Australia that have claimed the lives of more than a billion animals, by some estimates, are just one of the effects of global climate change the country's wildlife is grappling with. Australia is also currently in the grips of an extreme drought, and the nationwide average daily temperature recently hit nearly 106 degrees Fahrenheit, shattering the previous record.

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A Chinese paddlefish exhibited in the Museum of Hydrobiological Sciences, Wuhan Institute of Hydrobiology of Chinese Academy of Sciences. Alneth / CC BY-SA 4.0

Scientists have concluded of the largest freshwater fish species in the world is now extinct because of human activity.

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The Little Goose Dam on the Snake River near Starbuck, Washington. U.S. Army Corps of Engineers

By Jodi Helmer

Each year, millions of tons of grain make their way along what was once one of our wildest river systems, the Columbia-Snake River. Four dams — the Lower Granite, Little Goose, Lower Monumental and Ice Harbor — erected between 1955 and 1975, ease the way for massive barges bound for ports on the West Coast, and ultimately, markets in Asia. Soybeans, wood products, mineral bulks, and automobiles also travel the river by barge. But outnumbering all other cargo is the soft white wheat grown by farmers from 11 states.

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Native American tribes oppose a plan to build dams on the Little Colorado River (right side) upstream of Grand Canyon National Park. National Parks Service

A proposal to dam four parts of a Colorado River tributary for hydropower has drawn significant opposition from Native American tribes, environmentalists and regulatory agencies, according to the AP.

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The Lake Delhi Dam in Iowa failed in 2010. VCU Capital News Service / Josh deBerge / FEMA

At least 1,688 dams across the U.S. are in such a hazardous condition that, if they fail, could force life-threatening floods on nearby homes, businesses, infrastructure or entire communities, according to an in-depth analysis of public records conducted by the the Associated Press.

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Shrimp fishing along the coast of Nayarit, Mexico. Tomas Castelazo / Wikimedia, CC BY-SA

By Paula Ezcurra and Octavio Aburto

Thousands of hydroelectric dams are under construction around the world, mainly in developing countries. These enormous structures are one of the world's largest sources of renewable energy, but they also cause environmental problems.

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James Suter / Black Bean Productions / WWF-US

Only a little more than one-third of the world's 246 longest rivers remain free-flowing, drastically reducing the diverse benefits that healthy rivers provide to people and nature everywhere, according to a new study by World Wildlife Fund (WWF) and partners.

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Irina Vodneva / iStock / Getty Images Plus

By the Numbers

5: Priority recommendations that the U.S. Environmental Protection Agency (EPA) has implemented since March 2018. Those actions relate to chemical standards, nonpoint water pollution and water pollution assessment. There are, however, 14 priority recommendations that the agency has not acted on. (Government Accountability Office)

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