Officials have misled the public with their 20-year target for urban renewal, an academic has claimed. Ng Mei-kam, a university associate professor in urban planning, warned that Hong Kong would face an even bigger problem after two decades. Tung Chee-hwa said in his Policy Address the proposed urban renewal authority would shorten the redevelopment time from 30 to 20 years under a Singapore-style plan to rejuvenate old districts. More than 2,000 dilapidated buildings have been targeted for renewal. Professor Ng, speaking at RTHK's City Forum yesterday, said the number of run-down buildings far exceeded the target number and maintenance work could not achieve a permanent solution. 'The problems will become much bigger after 20 years.' Another critic said Mr Tung's environmental campaigns were inadequate. Man Chi-sum of Green Power said there had been resistance because the public and other interested parties had not been consulted.