Urban greening initiatives can reduce global warming impact, study finds

A study has found that urban greening initiatives, including planting street trees, rainwater gardens and de-paving can help to mitigate the impacts of global heating in cities due to rising climate crisis and urban expansion. The study has underlined that cities have been warming on an average by 0.5C a decade.

Scientists at Nanjing and Yale Universities carried out an analysis of satellite data from across 2,000 cities. The study included comparison of surface temperature readings between cities and rural areas during period 2002 to 2021. The study found that on average the cities are warming by a rate of 0.56C a decade during the day and by 0.43C a decade at night. The study also highlighted that in comparison the rural areas are warming by 0.4C a decade during the day and 0.37C a decade at night. This brings the inference that urban areas on average are warming 29 per cent more rapidly than rural areas.

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Jon Burke, the climate change manager at Gloucestershire council has suggested a number of urban greening initiatives such as rainwater gardens which can really make a significant difference to reduce urban heating. He said that “vegetation had a big role to play in moderating all the types of urban heating and could bring additional social benefits such as reduced crime and prescriptions for antidepressants”. He added, “UK urban leaders should have taken green infrastructure investment more seriously a decade ago. At present there isn’t one urban area within the UK with average canopy street cover above 40 per cent, which is the minimum amount of cover needed for a cooling effect to take place.”

Grahame Madge, a Met Office spokesperson said, “The Met Office has been working with a number of local authorities to help inform their heat resilience strategies and planning. When they combine this information with their own mapping they gain a far clearer picture of where the areas of greatest risk are across the city … this ability to know where to focus effort is extremely important.”

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