News At Seven-Thirty highlights: Monetary Authority says the number of Hong Kong mortgages in negative equity has quadrupled;revenue from land sales is around 60% lower than expected;Premier Wen Jiabao and British Prime Minister Gordon Brown stressed the need to boost world trade and avoid protectionism;heavy snowfall in United Kingdom; an American United Nations official has been abducted in Pakistan;KKFS Taxi Driver Association began a campaign;9 dead birds found at Sha Lo Wan on Lantau;Department of Health is investigating the death of a 6-year-old boy while he was on his way back to Hong Kong after visiting Penang in Malaysia;scientists from University of Zurich have developed a robot to help test sub-zero temperature clothing.