Climate change and urbanisation are the two challenges faced by cities globally. Urbanization is a major driver of greenhouse gas (GHG) emissions with cities consuming 67-76% of global energy and generating 71-76% of carbon emissions.
To address the challenges of climate change and the adverse effects of urbanisation, climate adaptation and climate mitigation need to be prioritised and included in land use planning.
The study by Lilai Xu, Xiaoming Wang and others look at the role of urban land use in both climate mitigation and adaptation using Xiamen, a coastal city in China as a case study. They investigated the trade-offs between climate change mitigation and adaptation in land use planning.
According to the researchers, land use planning has the potential to combat climate change as long that a balance between mitigation and adaptation is achieved.
Mitigation and adaptation have been considered separately in most urban planning as the resulting trade-off between them have not been studied well – specifically, the question of what urban forms could reduce greenhouse gas emissions and climate stresses while considering trade-offs between them.
Using the coastal city, researchers found that unilateral strategies for land use with either mitigation or adaptation can have contradicting results in reducing GHG and climate stresses and the study wanted to identify a win-win solution in land-use response.
The results of the study show that the appropriate urban form that could yield a balanced trade-off between climate adaptation and mitigation is an urban planning strategy that features the following:
- a moderate population density that limits urban sprawl and eases in overcrowding of urban centres
- apply a moderate mix of residential, workplace, retail and leisure areas.
- High road connectivity with enough intersections
- Properly planned and well-protected green spaces.
This urban form overlaps with the idea of polycentricity, which advocates multiple centres in the same metropolitan area to distribute population and economic activities rather than being concentrated in the main centre.
This climate-smart approach in land use planning can minimise trade-offs and achieve a win-win solution for both mitigation and adaptation. Implementation of this approach should be done without much delay to obtain co-benefits (decrease in transportation emissions per capita, reduction of urban heat island (UHI), and coastal inundation resiliency). Delay could mean uncontrolled sprawl of urban areas which reduce land spaces available in the future and potential for other actions to be implemented.
Major findings in the study are generalizable and transferable and can be applied to in other cities with similar problems.
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