In this forum, Terry Melo elaborated on the need to develop sustainable cities and shared ten strategic principles of sustainable cities. He emphasized that sustainable development was a new war, which required cooperation of all parties. He envisioned China as a leader in responding global climate changes. Ma Xiangming, the guest of this forum, also made a brief sharing. He analyzed the impact of technology capital on urban structure from micro, meso and macro levels, and connected it to the development characteristics of the Guangdong-Hong Kong-Macao Greater Bay Area.