AN exhibition showing how the latest in technology might help preserve and safeguard our much distressed environment is now being held in the main foyer of the Hong Kong Space Museum. Speaking at the opening ceremony of the ''US Environmental Technologies'' exhibition, Urban Councillor Ronnie Wong Man-chiu said he hoped the exhibition would arouse greater concern on the need to conserve nature. In the 1980s and '90s, mankind had begun ''to taste the bitter fruit of our short-sighted and irresponsible acts in taking advantage of nature'', he said. ''It is time we harness the technologies we have developed for another purpose - to safeguard our fragile environment for future generations,'' Mr Wong said. The exhibition, comprising a number of graphic panels, video programmes, computer softwares and other displays, was flown in from the United States - thanks to the sponsorship of Cathay Pacific. The exhibition is jointly presented by the Urban Council and the United States Information service. It will be open to public until March 28. Admission is free.