For now, the ambitious "eco-city" covering 30 square kilometres (11.6 square miles) of non-arable salt pans and former fishing villages has more cranes than wind turbines and will not be finished for at least another decade.

But its developers hope the settlement near the port city of Tianjin will serve as an ultra-efficient alternative to ill-planned and heavily polluting mega-cities not only elsewhere in the country, but around the world.

"We hope to influence our neighbours," said Goh Chye Boon, chief executive of Sino-Singapore Tianjin Eco-City Investment & Development Co.

"With the right ingredients, with the right eco mindset, I think together we can change the environment."

The governments of China and Singapore have combined their expertise and finances to develop the future city, which has a planned population of 350,000 and includes schools, medical facilities and business districts.

Foreign companies such as Japan's Hitachi and Dutch electronics giant Philips will provide green technology for the development, where buildings will be insulated and have double-glazed windows to increase energy efficiency.

Nearly two-thirds of household waste will be recycled and 20 percent of the city's power will come from renewable energy sources such as wind and solar -- with the rest coming from other sources such as highly polluting coal.

Treated sewage will be channelled into a lake which will supplement water supplies for local communities.

"Eco-cities are needed because China is facing a huge challenge of pollution," said Hiroaki Suzuki, a top specialist in the Finance, Economic and Urban Department of the World Bank, which is assisting on the project.

"China's serious pollution problems do not mean that it cannot develop an eco-city."

Top leaders in Beijing also hope the project will serve as a model for a long-term solution to the country's ballooning urban population, which is putting enormous pressure on already strained water and energy resources.

China is undergoing an unprecedented urbanisation process as hundreds of millions of people have headed to fast-growing metropolitan areas since the nation's economy embarked on a fast-paced growth track more than 30 years ago.

To handle the massive influx of people, China may need to invest up to 3.6 trillion dollars in urban infrastructure by 2020, state media said last month, citing a report by the state think-tank China Development Research Foundation.

Greenpeace supports the development of "eco-cities" as a way to handle urban overcrowding, which it says could prevent China from curbing its world-leading carbon emissions and meeting its ambitious energy targets.

"It's a really good idea because that is where change has to happen," Yang Ailun, climate and energy campaign manager for the environmental watchdog in China, told AFP.

But Yang cautioned it was very difficult for Beijing to develop truly low-carbon cities when there was no clear definition of the term and the country was still developing.

China has already broken ground on a separate ecologically friendly settlement that has yet to been finished.

In 2005, former British prime minister Tony Blair and Chinese President Hu Jintao agreed the two countries could collaborate on building the world's first so-called "eco-city" Dongtan, near Shanghai.

The "city of the future" was meant to be showcased at this year's World Expo in Shanghai but the settlement remains in the planning stages.

Plans for dozens of other low-carbon "eco-cities" and towns are springing up around the country, as developers rush to cash in on the green movement and government authorities seek to attract foreign investors to their regions.

China recently carried out low-carbon technology pilot projects in five provinces and eight municipalities, with the aim of rolling them out nationwide, said the country's chief climate change official, Xie Zhenhua.

"We hope that through our concerted efforts, we can work out incentives and policy measures that support upgrading of technologies and changing people's consumption patterns," Xie told reporters this week.

Goh insists the Tianjin development will not be another Dongtan -- construction of the first stage is under way, with the first batch of apartments on sale and residents due to start moving in as early as next year.

"We are far from the Dongtan example -- we have got over the masterplan stage and are executing it now," he said.

When AFP visited the sprawling site, several buildings were under construction, some streets had been paved and marked, trees planted and wind-solar powered street lights erected.

But it is a long way from the miniaturised model on display in the exhibition hall, which shows hundreds of high-rise buildings surrounded by 1,500 hectares of parks and wetlands, broken up by crystal-clear waterways.

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