'Dr Tree' sees green policies branch into HK planning

For decades, Jim has been trailblazing in shaping policies that protect these natural monuments. His influence was crucial in influencing the Mass Transit Railway Corporation's decision to preserve the stone wall trees at Forbes Street during the construction of West Island Line's Kennedy Town Station.

Perhaps the most recent and transformative aspect of Jim's work is his focus on green infrastructure, transforming rooftops and walls into sustainable ecosystems. Unlike traditional green roofs that often rely solely on grass or shrubs, Jim incorporated native trees to create self-sustaining and biodiverse spaces.

Besides the CLP rooftop forest, Jim has designed more than 20 green rooftops in Hong Kong, including projects for the University of Hong Kong and Tai Po Market Station. "The environmental benefits of these green spaces go beyond aesthetics," says Jim. "They help cut energy costs through natural insulation, extend lifespan for roof waterproofing, improve air quality, and support biodiversity, which in turn helps cities adapt to climate change."

At 71, Jim's work is as relevant as ever. His current projects include improving the microclimates in Hong Kong's cramped subdivided homes, where many low-income families live. "Urban ecology is not just about trees, but about the quality of life in cities, particularly in areas where the environment has been compromised by rapid development," he says.

For decades, Dr Tree's commitment has extended beyond research into mentoring the next generation of environmental scientists, including Benedict Essuman-Quainoo, a former PhD student and now a lecturer at the Education University of Hong Kong.

Benedict, originally from Ghana in West Africa, has embraced Jim's focus on "nature in cities", working to promote sustainable and resilient urban ecosystems in Hong Kong and elsewhere in the world, including his home country.

"In a city where every square foot counts, Dr Jim has shown that there is always space for nature to flourish," Benedict says.

"Dr Jim is so meticulous, from research design, and methodology to writing style, and is punctual in everything," Benedict says. "He is such an inspiration for me, both in the past and now, with that passion for research and care for his students."