5fish
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Where did the free flowing rivers go? Under concrete... Going green has its cost...
There did they go... The link has charts to tell the story...
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Only a third of the world’s great rivers remain free flowing, due to the impact of dams that are drastically reducing the benefits healthy rivers provide people and nature, according to a global analysis.
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Separate research in Britain, which included the effects of smaller infrastructure such as weirs, fords and culverts, suggests that 97% of the nation’s river network has been interrupted by human-built structures.
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Great rivers that flow freely are now rare in populated areas. Heavily fragmented rivers include the Danube, Nile, and Euphrates, the Paraná and Missouri in the Americas, the Yangtze and Brahmaputra in Asia, and the Darling in Australia. The Congo and Amazon were found to be among the least affected.
Here is another article a few more details on the issue and rivers...
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Just over one-third (37%) of the world's 246 longest rivers remain free-flowing, according to a new study published in the scientific journal Nature. Dams and reservoirs are drastically reducing the diverse benefits that healthy rivers provide to people and nature across the globe.
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Among other findings, the researchers determined only 21 of the world's 91 rivers longer than 1,000 km (~600 miles) that originally flowed to the ocean still retain a direct connection from source to sea. The planet's remaining free-flowing rivers are largely restricted to remote regions of the Arctic, the Amazon Basin, and the Congo Basin.
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Protecting remaining free-flowing rivers is also crucial to saving biodiversity in freshwater systems. Recent analysis of 16,704 populations of wildlife globally showed that populations of freshwater species experienced the most pronounced decline of all vertebrates over the past half-century, falling on average 83 percent since 1970.
There did they go... The link has charts to tell the story...
Only a third of world’s great rivers remain free flowing, analysis finds
Dams, levees, hydropower and habitat degradation behind fragmentation on huge scale, finds global assessment
www.theguardian.com
snip...
Only a third of the world’s great rivers remain free flowing, due to the impact of dams that are drastically reducing the benefits healthy rivers provide people and nature, according to a global analysis.
snip...
Separate research in Britain, which included the effects of smaller infrastructure such as weirs, fords and culverts, suggests that 97% of the nation’s river network has been interrupted by human-built structures.
snip...
Great rivers that flow freely are now rare in populated areas. Heavily fragmented rivers include the Danube, Nile, and Euphrates, the Paraná and Missouri in the Americas, the Yangtze and Brahmaputra in Asia, and the Darling in Australia. The Congo and Amazon were found to be among the least affected.
Here is another article a few more details on the issue and rivers...
Just one-third of the world's longest rivers remain free-flowing
Infrastructure development and other human-made changes have already fragmented or disrupted two-thirds of Earth's longest rivers. Dams and reservoirs are the leading contributors to connectivity loss in global rivers. A team of researchers assessed the connectivity status of 12 million...
www.sciencedaily.com
snip...
Just over one-third (37%) of the world's 246 longest rivers remain free-flowing, according to a new study published in the scientific journal Nature. Dams and reservoirs are drastically reducing the diverse benefits that healthy rivers provide to people and nature across the globe.
snip...
Among other findings, the researchers determined only 21 of the world's 91 rivers longer than 1,000 km (~600 miles) that originally flowed to the ocean still retain a direct connection from source to sea. The planet's remaining free-flowing rivers are largely restricted to remote regions of the Arctic, the Amazon Basin, and the Congo Basin.
snip...
Protecting remaining free-flowing rivers is also crucial to saving biodiversity in freshwater systems. Recent analysis of 16,704 populations of wildlife globally showed that populations of freshwater species experienced the most pronounced decline of all vertebrates over the past half-century, falling on average 83 percent since 1970.