While the crocodile is still swimming around happily in Yuen Long, challenging expert John Lever's crocodile-hunting ability, another wild animal, a polar bear, has recently arrived Hong Kong. But don't panic - it is just a costume used in a campaign organised by environmental group Greenpeace China to raise students and the public's awareness of global warming and renewable energy. Today, the team will bring their polar bear to visit Ling Nam Hang Yee Memorial Secondary School in Siu Sai Wan. Exhibition boards, a 12-minute video on global warming and a demonstration of solar cells will also be featured in the programme. According to the Norwegian Polar Association, polar bears could become extinct within 60 years if global warming continues. At present there are about 22,000 polar bears surviving around the Arctic. Due to global warming, the ice floes and glaciers in the Artic Ocean have begun melting faster than usual, affecting the habitats of polar bears and their prey, seals. Recently, the authoritative science magazine Nature reported that the average thickness of Arctic glaciers had been reduced from three metres to less than two metres in the past three years alone. Greenpeace China outreach campaigner Gloria Chang Wan-ki said the burning of fossil fuels such as coal and oil was the main source of carbon dioxide, which causes global warming when released into the atmosphere. Despite this, Hong Kong's two power companies are still burning fossil fuels to generate electricity, Ms Chang added. She urged students and Hong Kong people to reduce the consumption of electricity and try to use appliances that used renewable energy, such as solar calculators and watches. 'Basically, we hope students will have a better understanding about renewable energy and give their support to its use in Hong Kong,' Ms Chang said. At the moment, Hong Kong has no renewable energy systems. 'But in fact Hong Kong is very suited to the use of renewable energy, especially wind power,' said the environmentalist. She said the cost of wind power was comparatively low. 'We think the islands in Hong Kong are suitable for building wind power plants. 'However, it's more a policy than a technical issue,' she said. The polar bear will be on show on Sunday from 2pm to 6pm at the pedestrian area in Mong Kok.