Environmentalists are calling upon the Government to create a 'balanced' development plan when it reviews the proposed west country park extension on North Lantau Island. At issue is the question of where the boundary lines for the new park will be drawn. The land review is currently underway, with the Government expected to release a consultation paper later this year. Environmentalists say the area is under threat from sprawling development and spin-off industries that will migrate north of the proposed Disney site at Penny's Bay. 'We are fighting for a North Lantau country park extension,' director of Friends of the Earth, Mei Ng, said. 'We need a balance so we don't over-develop one of the greenest islands in Hong Kong and turn it into an artificial entertainment centre.' Ms Ng, who is also committee chairman of the country marine parks board, worries that the green belt could turn into a sprawling mass of entertainment venues with proposed ventures that include a Universal Studios complex, a technology dome and a casino. She said the Government should work towards preserving the unique ecology of the island by establishing no-go areas that would protect carpets of bio-diversity. The only way to make sure that happened, she said, would be to give guaranteed protections that capped growth and development. 'Without holistic planning you are going to spoil Lantau,' Ms Ng said. 'Sustainable doesn't mean there is a total leaning towards the environment. Sustainable development means balancing the environment, the economy and social development.' Despite her calls for a truce in the trench warfare that separates development advocates and environmentalists, Ms Ng questioned the logic behind the Disney project's go ahead. Although the theme park might bring short-term gains, she believes the Disney project is the wrong way to build for the future. 'Is this ad hoc response to boosting an economy the right way to boost an economy?' she asked. Instead of always drafting a mega-project in times of need, Ms Ng said the Government should use Sai Kung - the 'cleanest com munity in the region' - as an index for the kind of ecological neighbourhood that could be created throughout the SAR. In addition to North Lantau country park boundary lines, Ms Ng said the Government's consultation report would have to look at the value of pristine inner waterways and also seek to protect historical sites. Preserving green areas would also help to attract tourists, according to Friends of the Earth researcher Eric Walker. He said maintaining a healthy environment would have huge economic benefits. 'We need to understand the value of the countryside as a nature and tourist area,' he said, adding that tourists often visited Hong Kong to walk the country parks and soak up the natural scenery.