Architecture and urban planning for social good - in conversation with Climate Reality Leader HY William Chan

We recently had the opportunity to chat to HY William Chan, Sydney’s youngest-ever elected city councillor with the Lord Mayor’s government chairing environment and climate change, transport, heritage and planning. He is also Head of Delegation to the UN Conference of the Parties, Co-Founder of Climate Action Week Sydney, and a dedicated Climate Reality Leader.

As a forward-thinking urbanist and futurist, William brings his expertise in architecture and urban planning to tackle some of the most pressing issues of our time—social inclusion and climate resilience within urban environments. 

Our conversation delved into how he leverages design to build communities that not only endure but thrive in the face of climate challenges, and how his innovative approach is shaping a more inclusive, liveable future for all.

Climate Reality: What inspired you to focus your career on climate change and urban resilience, and what drives your continued commitment to this work?
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William: During my formative years as an architect, I witnessed how vulnerable, urban communities are often the first to be impacted by climate change. I’m driven by the belief that cities can lead the way in creating a future where people and the environment thrive together.

Climate Reality: Why did you choose to become a Climate Reality Leader, and how has this experience shaped your approach to climate action?

William: Becoming a Climate Reality Leader gave me the tools to connect global climate science with local action. It reinforced my belief in city-making and policymaking as a powerful way to engage communities and inspire meaningful local change to urban planning, architecture and sustainable development.

Climate Reality: Your work spans from urban planning to smart infrastructure. How do you prioritise climate resilience in your projects, and what are some innovative approaches you've found most effective in mitigating the impacts of climate change?

William: I focus on recognising nature-based solutions as critical urban infrastructure, which includes urban forests, green roofs and facades, water sensitive urban design, and street bioswales (linear, vegetated ditches which allow for the collection, conveyance, filtration and infiltration of stormwater).

 The key is designing for flexibility, so that communities can adapt to shifting climate challenges over time.
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Climate Reality: Having worked on projects from Sydney to Milan, how do you adapt your climate-focused urban solutions to different cultural and socio-economic contexts?

William: It starts with working with people as partners, recognising that every city has its unique strengths and challenges. Whether it's integrating green and smart infrastructure in Milan or improving affordable housing access with environmentally sustainable amenities in Sydney, co-designing with citizens ensures climate strategies address the social fabric and priorities of each place.

Climate Reality: What are the biggest challenges in getting communities and policymakers to collaborate on climate-focused urban development, and how can we overcome them?

William: The biggest challenge is building trust, especially when timelines and priorities differ. Open dialogue and early engagement are essential to finding common ground and making sure everyone feels invested in the outcome.

Climate Reality: Reflecting on your diverse career, what have been some of your standout moments where you’ve seen the impact of your work on climate change and communities?
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William: One highlight is initiating Australia’s first Climate Action Week. This community-led, grassroots event in the Pacific region scaled within 10 weeks to over 100 events, mobilising a combined audience of 35,000. We’re building a social movement to recognise indigenous communities, engage the entire climate action ecosystem, showcase Sydney and Australia as epicentres of climate leadership, attract domestic and global talent and investors, and strengthen regional efforts to reach net zero.

Climate Reality: Can you tell us about any exciting upcoming projects and initiatives?

William: I’m working to further Australia’s role in collaborating with cities and local leaders, having witnessed Australia’s signatory to the Coalition for High Ambition Multilevel Partnerships (CHAMP). I will also continue to advocate for the Australian government to join the Buildings Breakthrough target. This global initiative aims to make near-zero emission and resilient buildings the new norm by 2030 – an essential built environment goal that Australia has yet to commit to.

Climate Reality: What advice do you have for anyone wanting to work in this space?
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William: Don’t wait for permission – start where you are and with what you have. Find intergenerational allies, stay curious and remember that small actions build momentum for larger change.

Climate Reality: Is there anything else you would like to add?
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William: Cities are on the frontlines of the climate emergency, serving as first responders to its impacts. Their leaders play a vital role in cutting emissions, addressing climate risks, and driving national efforts to accelerate meaningful climate action. With the right support, I know cities have the power to transform ambition into tangible progress.