Hong Kong is seeking to reduce its greenhouse gas emissions at least 50 percent by 2020 from 2005 levels, the city’s secretary for the environment said. Businesses in the city, which consume about 40 percent of Hong Kong’s power, have been offered incentives to construct energy-efficient buildings or to reduce power use in existing structures, Wong Kam-sing said today in an interview in New York. Hong Kong also is promoting rooftop solar systems and turning food waste into energy. “We’d like to improve our livability, particularly air quality, at the same time we further reduce our carbon footprint,” Wong said. The city of 7.2 million people has per-capita greenhouse gas emissions of about 6 metric tons, compared to about 18 metric tons a person in the U.S. and Australia, according to data compiled by the Hong Kong Economic & Trade Office. “We’d like to raise the bar and set an even more ambitious target,” Wong said.