Welcome to the fourth issue of Innovation Digest, where we turn our focus to one of the most pressing challenges of our time: "Combating the Irreversible Climate Change to Cultivate a Sustainable Future". 

Climate change is not just an environmental issue; it is a complex, global challenge that touches upon every aspect of our lives, from the food we eat to the air we breathe. Its impacts threaten ecosystems, economies and communities worldwide. Our scholars work with unwavering dedication to illuminate the origins of climate change, striving not only to unravel its complexities but also to raise public awareness of its profound significance. Research topics featured in this issue of Innovation Digest include:

• revealing the changes in the Earth’s hydrological systems that cause drought and sea level rise
• comparing six existing heatwave indices to analyse and highlight the urgent need for a standardised heatwave index
• differentiating carbon types to refine our understanding of climate impacts

At the heart of addressing climate change lies the concept of sustainability: meeting the needs of the present without compromising the ability of future generations to meet their own needs. Sustainable development offers a roadmap for balancing economic growth, social inclusion and environmental protection. By embracing renewable energy, responsible consumption and innovative technologies, we can reduce greenhouse gas emissions and build resilient societies. Our scholars’ innovations include:

• semi-wet carbonation for transforming construction waste into recycled concrete aggregate
• a novel radical scavenger in inverted organic photovoltaics to enhance solar energy harvesting
• pinpointing aluminium atoms in a zeolite framework for making more efficient and stable catalysts
• a sustainable and smart floating structure solution to address Hong Kong’s land scarcity
• advanced cobalt-based catalysts for safer and cleaner hydrogen fuel cell vehicles

The Engagement & Partnership section continues to present the University's recent collaborations with external partners. Finally, our Student Corner features achievements of PolyU students.

The journey towards sustainability requires collaboration, creativity and a commitment to equity, ensuring that no one is left behind as we adapt to a changing world. Together, let’s discover how our choices made today can shape a healthier, more sustainable future for all.

Prof. Cheng DONG Chairman of the Editorial Committee Associate Vice President (Mainland Research Advancement) Chair Professor of Cell Engineering and ImmunoMedicine, Department of Biomedical Engineering