Living Smart

II ENVIRONMENT & SUSTAINABILITY 076 077 global temperature rises well below the two degrees above pre- industrial revolution levels stipulated in the Paris Agreement, a treaty that for the first time brought all nations into a common cause to undertake ambitious efforts to combat climate change. Hongkongers will also suffer from the continually rising temperatures: the already humid and hot climate will amplify because even a modest warming may exceed critical levels of heat stress. Our body has a thermal limit. When the wet-bulb temperature – used as the indicator of heat comfort – hits 35 degrees, the human body loses the ability to cool itself down by sweating and will die in a matter of hours. Therefore, a place with a wet-bulb temperature that is already high enough to present very uncomfortable conditions with present climate conditions like Hong Kong will face a serious problem if two or three degrees of warming is expected in the future. Moreover, the effects of urbanization will intensify the risk level of extreme heat for exposure to poor living conditions, such as in subdivided flats in our city. Climate change was once an abstract concept, but the recent heat extremes may serve as a lesson to enhance public awareness of the potential drastic impact of climate change, as extreme conditions have caused considerable casualties and damage worldwide. Without public support and engagement, it will not be possible to translate and implement scientific findings to general practice and policy. While it is important to develop countermeasures to minimize damage from expected climate extremes through coordinated adaptation efforts, all nations should also take an immediate action to mitigate climate change by significantly cutting greenhouse gas emissions from a global perspective. Pursuing the nationally-stated mitigation ambitions as ratified under the Paris Agreement may make it possible to follow the global greenhouse gas emission pathways that help prevent catastrophic consequences. For instance, changing from a high dependency on fossil fuels to a timely diversification of renewable energy sector is required. Published on August 21, 2019