The Secretary for the Environment, Mr Wong Kam-sing, today (September 12, San Francisco time) attended the Cities4Climate conference, an affiliate event of the Global Climate Action Summit (GCAS), in San Francisco, the United States. At the session entitled "In Conversation: Where Equity Meets Sustainability", Mr Wong introduced Hong Kong's work in combating climate change, including the challenges faced in the city's compact environment and the opportunities arising from it.