Showing posts with label Ecological impact. Show all posts
Showing posts with label Ecological impact. Show all posts

Tuesday, November 03, 2009

China's Three Gorges Dam comes of age

Nov 4, 2009
By Antoaneta Bezlova
Inter Press Service


BEIJING - Fifteen years after dynamite blasts first shattered the peace of China's breathtaking Three Gorges, the Three Gorges Dam - the pride of China's engineering progress - is nearing completion. But the cannonade of criticism bombarding the world's largest and costliest dam in history is far from over.

In a matter of days the water level in the reservoir on the Yangtze River will reach its final height of 175 meters. With every meter of water filling the concrete coffer the swell of domestic opposition has increased and the voices of its international critics have grown louder.

Unlike 12 years ago, when Beijing staged elaborate celebrations to mark the diversion of the Yangtze on the spot of the future dam, this time around officials and engineers are marking the completion of the dam in a low-profile manner.

At home they are facing criticism that the filling of the dam is exacerbating the drought afflicting the river's delta. Abroad, where China has attempted to export its Three Gorges model of generating economic growth through huge hydropower works, Chinese engineers are being confronted with homegrown opposition to such projects. Chinese diplomats are seeing a rising tide of discontent with Beijing's expansion of hydropower diplomacy across Asia and Africa.

Yet perhaps the most compelling reason for holding back the fireworks is that the Three Gorges Dam stands as a monument to obsolete ambitions. As China increasingly turns to new forms of renewable energy and even claims leadership in the next wave of green development, the dam sends a signal of confused priorities.

"The Three Gorges dam is a model of the past," says Peter Bosshard, the policy director of California-based International Rivers, whose avowed mission is "to protect rivers and the communities that depend on them".

"There are smarter ways of generating energy and managing floods than by building outdated mega-projects," adds Bosshard.

Damming the Yangtze was one of the dreams of Sun Yat-sen - the founding father of modern China who toppled the Qing Dynasty in 1911. Chairman Mao Zedong ordered the first digs on the project before the turmoil of the Cultural Revolution (1966-76) put a halt to it. Both saw the dam as a way of controlling devastating floods along the lower Yangtze and creating a backbone for a national power grid.

No longer a thing of dreams but a reality, the Three Gorges Dam has a capacity of 18,000 megawatts of electricity. But in the process of its construction 1,350 villages were submerged and 1.3 million people displaced from their homes.

It is not only the world's largest but also the costliest hydropower project ever undertaken. When it was approved in 1992, its cost was estimated at 57 billion renminbi (US$8.3 billion). In the meantime, it has risen to $27 billion by the Chinese government's reckoning and to $88 billion by some outside estimates.

The hidden costs of the dam are only now beginning to emerge. Blocking the river flow has changed the ecosystem of the Yangtze to a degree that rare river species of dolphin and sturgeon are now facing extinction. The commercial fisheries in the Yangtze and off the river's mouth in the East China Sea have declined sharply. Other disastrous side effects have included the pollution of freshwater supplies, deadly landslides and an increased risk of earthquakes.

In September 2007, government officials admitted that "if preventive measures are not taken, there could be an environmental collapse".

It was former premier, Li Peng, an engineer by education, who was the driving force behind the project and who will be remembered for it. In 1992, Li managed to suppress opposition to the project at home and ram approval for the dam through the parliament. Experts say the effort was motivated by Li's desire to rebuild his political legacy in the aftermath of the 1989 Tiananmen Square crackdown on democracy, which he oversaw.

The damming of the Yangtze "is an event that not only inspires people but demonstrates the greatness of the achievement of China's development", he said in 1997, presiding over the ceremony to mark the river's diversion.

These days, though, Chinese politicians are talking about developing a "low-carbon" economy, and describing China's greatness in terms of massive dams is no longer the phrase of the day.

The country is now the world's leading producer of greenhouse gases and in recent years has taken an aggressive path to develop alternative sources of energy. China is planning to build more nuclear power plants, become the front-runner in wind and solar-power generation and dramatically raise the efficiency of all new buildings.

But the debate on how to go forward with developing hydropower - a controversial power source because of its impact on river ecosystems - is ongoing.

China now leads the world in installed hydropower capacity, with 150 gigawatts (GW) of capacity, according to the London-based International Hydropower Association, which represents the hydropower sector. The Chinese government plans to expand this capacity to a future level of 700 GW.

More than 100 dams are being planned for the middle and upper reaches of the Yangtze River. What is more, China is actively seeking to export its Three Gorges expertise abroad, signing up agreements to build hydropower works in countries from Cambodia to Pakistan and Nigeria.

Proponents of the hydropower industry here are unequivocal in their support for more dams. Pan Jiazheng, hydrologist with the Chinese Academy of Engineering, argues that water is the only renewable energy source in China that can be developed on a large scale.

"Developing hydropower is the only viable way to make a dent in China's consumption of coal," Pan says. "Those who argue that hydropower is not a clean energy have to ask themselves whether there is any other task more urgent for China's clean development than burning less coal".

In 2008, thermal power accounted for 80% of China's total energy output. Hydropower generated 16.4% of the country's energy mix, while nuclear energy accounted for less than 2%. While China is racing ahead to install more wind- and solar-power capacity, the energy generated by these works is considered too costly and insufficient to satisfy the country's voracious power needs.

Critics of hydropower expansion, though, are equally forceful.

"It is quasi-science to believe that hydropower equals green energy," says Zheng Yisheng, who researches environment and development at the Chinese Academy of Social Sciences. "You can't see rivers just as a source of energy and choose to ignore their ecological function as eco-systems. People need energy but they need a place to live too."

Tuesday, July 28, 2009

Rubber Tree Growing in S. E. Asia Expanding, Along with Risks

(Photo: M. Arunprasad)

July 27th, 2009

Written by Michael Ricciardi
Eco Worldly


Unrestricted expansion of rubber tree plantations in South East Asia could lead to “devastating environmental effects”, according to authors Ziegler, Fox and Xu writing in a May, 2009 perspective article in Science.

Throughout the “montane” (foot hill and low mountainous) mainland of South East Asia (inclusive of Thailand, Vietnam, Cambodia, Laos, Myanmar, and China), rubber plantations are expanding. So far, an estimated half million hectares have been planted, and by 2050, that land mass area could triple. This expansion will come at a cost to broad leaf, evergreen forests and “swidden” areas (with vegetation from older slash and burn efforts).

Replacing both primary and secondary forests, the authors assert, will have an impact on long-term bio-diversity (creating “permanent monocultures”) and reduced total carbon biomass (note: forests derived much of their carbon biomass from uptake of atmospheric CO2).

Much of the current planting of rubber trees (Hevea brasiliensis, aka Para Rubber trees, whose sap is pure latex) is along sloping land areas and on foot hill and mountain sides (often converted to step agriculture) which naturally channel water into streams and lakes at lower elevations. The danger and risks from this expanding agricultural effort are many, and include: accelerated erosion of soil cover, excess stream sedimentation m(due to repeat cultivation on slope without adequate conservation), increased landslide risks (due to permanent conversion and road building), depletion of streams and lakes (due to irrigation needs), and decreased water quality (from pesticides and fertilizer runoff). Many of these risks and hazards–including permanent loss of forest cover–have already been encountered by farmers growing palm oil mono-cultures further into the interior of this region.

Perhaps ironically, these risks come on with a near half-century effort to mitigate, diminish swidden, slash-and-burn practices that were believed to be at the time quire environmentally destructive. Although these older practices did have some environmental and ecological consequences, over the years it has become clear from observation and studies that these consequences (in this region) were not as negative as once expected. Collectively, these various nation’s policies to move away from these practices (which are also less industry-efficient ones) and establish more productive cultivation systems, is resulting in far more harm, according to the authors, than the previous swidden agriculture base.

Scientists now must focus their research on studies of evapo-transpiration and hydrology (total water use) in these forests to determine real environmental impacts. The governments of Cambodia and Thailand are currently conducting such studies and it is hope that other nations will follow suit. Also, efforts are underway to expand reserve areas to preserve biodiversity and carbon biomass. Some have sugested paying farmers not to cut down the evergreen forests. The authors cited here also suggest encouraging “diversified agro-forestry systems” which permits extensive planting of rubber and palm oil trees, but not as monocultures. These systems represent a sort of “hybrid” compromise between total preservation of all forested areas and the creation of monoculture plantations, which produce a myriad of negative ‘eco’ and ‘enviro’ effects.

Tuesday, January 29, 2008

Hun Sen's "battery of Asia" dams are serious threats to people

Cambodia's biggest hydropower dams serious threats to people

Mon, January 28, 2008
By Supalak G Khundee
The Nation (Thailand)


The construction of Cambodia's first and second biggest hydropower dams pose serious threats to eco-systems and the livelihood of thousands people in southwest of the country, an environmental conservationist report said Monday.

Under an aid package of $600 million(Bt18.6 billion) from China, Cambodia is constructing the Kamchay Dam with an installed capacity of 180 Megawatts (MW) the biggest in Cambodia in the southwestern Kampot Province and the 120 MW Stung Atay Dam in Pursat Province.

The Kamchay Dam developed by China's largest hydropower developer, Sinohydro Corporation, is located wholly within the Bokor National Park and will flood 2,000 hectares of protected forest, according to a research report by the US-based conservationist International Rivers.

The project, to be completed by 2010, denied access to nontimber forest products to local residents, for whom many is an important source of income, and potentially a negative impact on a local tourist resort downstream of the dam, it said.

The Stung Atay, constructed by Yunnan Corporation for International Techno Economic cooperation, will be completed by 2012. The dam will flood a substantial area of the Central Cardamom Protect Forest, the report said.

"Cambodia's free flowing rivers and abundant natural resources are invaluable assets, the health of which are vital to the wellbeing of Cambodia's rural population," said Carl Middleton, Mekong Program Coordinator with International Rivers.

"Poorly conceived hydropower development could irreparably damage these resources and undermine Cambodia's sustainable development."

At present, only 20 percent of households in Cambodia have access to electricity. It is expected that the soaring demand for electricity will increase to more than 900 from the 212 MW in 2002.

The government has many hydropower projects under feasibility study, including the Sambor Dam to be built in the mainstream of the Mekong River in Kratie Province with a capacity of 465 or 3500 MW depending on the design and size of the reservoir.

The Sambor Dam, if built, would block major fish migrations and could decimate the income of tens of thousands of subsistence and commercial fishers. The dam also threatens the habitat for the endangered Irrawaddy Dolphin, around which a thriving local tourism industry has grown.

The Ministry of Industry, Mine and Energy estimated the country has the potential to generate approximately 10,000 M, of which more than 50 percent will come from the Mekong mainstream.

Cambodian Foreign Minister Hor Namhong told an investment conference in Tokyo recently that his country has a great potential to generate electricity supplies for the region. Apart from Laos, Cambodia could be the "battery of Asia", he said.

The report recommends that Cambodia adopts international best practices in electricity planning, including the findings of the World Commission on Dams, which is widely recognised to be the international standard for energy and water planning.

"Cambodia has many choices for meeting our electricity needs including renewable and decentralised energy options that must be explored," said Ngy San, Deputy Executive Director with the NGO Forum on Cambodia.

Tuesday, November 27, 2007

Green group urges Laos to stop dam expansion plan

Tue Nov 27, 2007
By Darren Schuettler

BANGKOK, Nov 27 (Reuters) - A major expansion of a hydropower dam in communist Laos will cause serious flooding, ruin fisheries and displace thousands of people living downstream, a Norwegian environmental group said on Tuesday.

Water releases from the Theun-Hinboun dam had already ruined the ecology of two rivers and damaged fisheries and farms since it was built a decade ago to supply electricity to neighbouring Thailand, the group said in a new report.

"In a cruel irony, many of the people to be affected by the expansion project have already been seriously affected by the existing Theun-Hinboun Hydropower Project," the report by the Association for International Water Studies (FIVAS) said.

The Theun-Hinboun Power Co, owned jointly by Norwegian state power utility Statkraft, a Thai power firm and the Lao government, had so far failed to pay compensation to people living downstream, it said.

The company should shelve the plan "until it has proven that it is capable of restoring the livelihoods of communities affected by the existing project," FIVAS director Andrew Preston said in a statement.

Statkraft, which owns 20 percent of the joint venture, said $45 million had been set aside in the project to address the problems mentioned in the report such as by building houses, schools, infrastructure and health stations.

But Statkraft brushed off FIVAS' demands to back out of the project, which will double power production from the dam.

"We think this is a sustainable and a right project in a region experiencing strong growth and strong demand for energy," said Statkraft's spokesman Knut Fjerdingstad.

The expansion involves the construction of a 65-metre (213-ft) high dam on the Nam Gnouang river and a water diversion to the Nam Hai and Nam Hinboun rivers.

The report estimated it would "affect over 50,000 people who will suffer flooding, displacement, erosion and loss of livelihood if the project is approved", of whom 4,200 would be forced to move to higher ground.

Fjerdingstad said the challenges cited in the report were known to Statkraft, and the company would take seriously any input that could contribute to improving the project.

"This project will happen whether Statkraft is in on it or not. We can contribute to making this a better project," he said. The start-up is planned for 2008, though the final decision has not been made, he said.

WESTERN INVESTMENTS

The report was released ahead of a workshop on the expansion plan being held this week in the Lao capital, Vientiane.

The study was conducted by a research team that interviewed people in five villages along the Hai and Hinboun rivers in May.

Landlocked Laos says it wants to become "a battery for the region" by building a series of dams with funds mainly coming from neighbouring Thailand, China and Vietnam.

Western companies are also investing heavily in Laos, led by French electricity group EDF, which is involved in the massive Nam Theun 2 project.

Lao Prime Minister Bouasone Bouphavanh told Reuters last week his country was committed to supply 7,000 megawatts to Thailand, 5,000 megawatts to Vietnam and 1,500 megawatts to Cambodia by 2015.

The government has said it will use the profits from hydropower sales to fight poverty in the country of 6.5 million people, where the average monthly income is less than $2 a day. (Additional reporting by Aasa Christine Stoltz in Oslo; Editing by Michael Battye and Roger Crabb/James Jukwey)

Tuesday, April 24, 2007

[Himalayan] Glacier loss [due to global warming] to hit Asian farmers [including those living along the Mekong river]

Tuesday, 24 April 2007
Reuters

The loss of glaciers in the Himalayas from global warming threatens hundreds of millions of farmers across southern Asia and China, Chinese climate scientists say.

Commenting on their contributions to an upcoming UN climate change report the scientists said the disappearance of glaciers would first swell major river systems in the region before leading to substantial reduction in water flow.

The Himalayas, surrounding highlands and the Qinghai-Tibet Plateau are home to a network of glaciers covering 500,000 square kilometres, major sources of water for the Ganges river in India, China’s Yangtze and the Mekong feeding Cambodia and Vietnam.

The repercussions could be enormous for the populations of the region with food production cut and farmers’ livelihoods ruined.

Wu Shaohong of the Chinese Academy of Sciences said these glaciers could recede to just 100,000 sq km by 2030 if global warming continues unchecked.

Chinese climate scientist Qin Dahe predicted, however, that about one-quarter of glaciers on the Qinghai-Tibet Plateau could melt by 2050.

The Chinese government says lakes, wetlands and grasslands would retreat and more agricultural land would turn to desert.

The chairman of the Intergovernmental Panel on Climate Change (IPCC), India’s Rajendra Pachauri, said glacier loss would threaten disaster for his country, northern India being “the granary of South Asia”.