Greenpeace activists broke into the Tsing Yi chemical waste treatment centre yesterday. They hung banners from a storage tank, protesting against plans to burn medical waste at the plant. The stunt was designed to draw attention to what Greenpeace says are the public health threats posed by burning the waste. Three activists wearing neon orange suits climbed the tank to unfurl a banner reading 'Stop Dioxin', while eight others chained themselves to the staircase to prevent police interfering with the protest. The climbers spent the morning hanging from their banner, which was flapping in a stiff wind, while they waited for a meeting the group demanded with government officials. 'We have tried to talk with the Hong Kong Government before but they do nothing,' Greenpeace campaigner Clement Lam Hao-kin said. 'This is the last resort.' The Government plans to refit the plant, which now burns chemical waste, to handle most of the medical waste. It says incineration is the only option for mounting waste problems. Greenpeace urged the Government to end the plan to burn medical waste, end dioxin emissions and conduct more extensive health tests on the effects of dioxins on humans. Environmental protection officials met Greenpeace yesterday. 'Greenpeace wants a no-dioxin policy,' said John Rockey, assistant director of the Environmental Protection Department. 'We understand their point of view but the solutions we put into effect will not have an adverse effect on human health.' Mr Rockey said Greenpeace gleaned its information about toxins from other parts of the world and the group had not examined solutions for Hong Kong. Because of the sensitivity of the issue, the Government would consider funding more studies about the effect of dioxins on breast milk. Principal environmental protection officer Ellen Chan Ying-lung said Greenpeace had discussed medical waste with the department before and knew it was exploring alternatives to incineration.