What is the main problem with the building of dams on the Mekong River?

Hydropower dams have had a dramatic effect on the Mekong river over the last two decades, resulting in unseasonable flooding and droughts, low water levels in the dry season, and drops in the amounts of sediment carried by the river, with drastic consequences for biodiversity and fisheries.

What are the negatives of the Mekong River dams?

These dams impede sediment and nutrient transport, causing coastal erosion in the Mekong delta, and disrupting river hydrology, which has facilitated deforestation and loss of fish production in the Tonle Sap Lake.

What are the two main problems that the Mekong River is facing?

The Mekong River ecosystem is on the verge of irreversible collapse due to the accumulative effects of climate change and increased numbers of upstream dams as well as other human-made activities such as deforestation, sand mining, extensive irrigation for agriculture and wetland conversion.

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Why do dam buildings on the Mekong cause international tensions?

The Mekong basin is witnessing an enormous expansion of dam-building for hydropower generation, especially in China and Laos. This has led to diplomatic tensions as countries downstream of the dams fear the negative impacts they may bring about, from greater flooding to seasonal lack of water.

How polluted is the Mekong River?

The Mekong is one of the most polluted rivers in the world, transporting an estimated 40 thousand tonnes of plastic into the world’s oceans each year. … Understanding how plastic flows along the Mekong into the ocean is key to reducing its impact.

What has happened to the Mekong River?

A combination of drought and controversial upstream water politics is setting up Southeast Asia for potential disaster. Drought and upstream dams have shrunk the Mekong River to its lowest levels in a century and threaten fish spawning—bad signs for the region’s food supply.

What is the main effect of climate change in the Mekong Delta Vietnam?

Warmer and wetter. Across the Greater Mekong region, temperatures have risen by 0.5 to 1.5 ºC in the past 50 years and continue to rise. More frequent and severe droughts and floods are already causing extensive damage to property and loss of life.

What are the environmental problems in Laos?

Environmental problems in Laos include deforestation, the effects of dam construction, the use of explosives to catch fish, and poaching of wild animals. Efforts to tackle these problems have been disrupted by corruption, lack cooperation and a lack of will.

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Why is the Mekong River so geographically important?

It is the major transportation highway and supplier of life for most of Southeast Asia—with five cities over 100,000 and one-third of the populations of THAILAND, LAOS, CAMBODIA, and Vietnam (60 million people) in the lower Mekong basin—yet much of it is still undeveloped (the first bridge was built in 1993, between …

Is the Mekong River saltwater or freshwater?

Species. The Mekong giant catfish can weigh up to 770 pounds and is the third largest freshwater fish on the planet. The Greater Mekong has no fewer than 20,000 species of plants, 1,200 bird species, 800 species of reptiles and amphibians, and 430 mammal species. Over 1300 new species have been catalogued since 1997.

How many dams are along the Mekong River?

Eleven massive dams straddle the mighty Mekong River before it leaves China and flows into Myanmar, Laos, Thailand, Cambodia, and on into Vietnam.

How does the construction of dams on rivers lead to an increase in water pollution?

the water which dams stores is stagnant. this causes diseases as stagnant water give rise to mosquitoes. during the time of heavy rain the gates of dams are opened which causes floods in nearby areas. … so the whole water is contaminated by human, household wastes.

Who is building dams on Mekong River?

Protests against Laos’ plans to build a network of 11 dams along the Mekong River with backing from neighboring Cambodia, Thailand and Vietnam have been going on for decades. The four countries hope that energy produced by the network will drive economic growth in the region.

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How many dams does China own?

The tallest dams in China are some of the tallest dams in the world. Nearly 22,000 dams over 15 metres (49 ft) in height – about half the world’s total – have been constructed in China since the 1950s.