A recent comprehensive review conducted by the Global Centre for Clean Air Research (GCCAR) highlights the significant heat-mitigating effects of green spaces, particularly botanical gardens, during heatwaves. The study aims to inform city planners and policymakers about the critical role of these spaces in moderating rising temperatures due to climate breakdown.
The researchers are establishing the Reclaim Network Plus, a global initiative involving planners, academics, city officials, charities, and businesses to examine the evidence supporting the benefits of green and blue spaces in urban planning. The research specifically identifies botanical gardens, such as the Chelsea Physic Garden and Royal Botanic Gardens in London and Gardens by the Bay in Singapore, as reducing air temperatures in city streets during heatwaves by an average of 5 degrees Celsius.
The study emphasizes that urban parks, wetlands, green walls, street trees, and playgrounds also significantly contribute to temperature mitigation. The director of GCCAR, Prof Prashant Kumar, explains that the research offers the most comprehensive understanding to date of how green spaces cool cities, including mechanisms like tree shade and evaporating water.
The Reclaim Network Plus seeks to promote the implementation of green and blue infrastructure in urban environments globally. The study recommends that larger parks tend to have a more considerable cooling effect, and cities can maximize benefits by connecting green spaces into “green corridors.” This collaborative approach is seen as a solution to the challenges posed by global heating, making cities more resilient and enhancing the well-being of their citizens.
While local factors play a crucial role, the research underscores the lack of systematic research into different types of urban green spaces and their impacts. The authors call for increased investment in research tailored to specific communities, as there is no one-size-fits-all solution. The findings provide a foundation for evidence-based city planning, emphasizing the importance of diverse green and blue spaces in creating healthier and happier urban environment.
