In nine cities across the world, thanks to planting schemes on walls and roofs, the temperature during the warmest month in so-called street canyons -- flanked by high-rise buildings on either side -- can be reduced by 3.6 to 11.3 degrees Celsius at the hottest time of day, according to a report by the French Agency for Ecological Transition.
Green spaces have also been shown to improve health and wellbeing, including by reducing stress, anxiety, and depression, improving attention and focus, better physical health, and managing post-traumatic stress disorder, said Stephanie Merchant of Bath University's department for health.
Replanting initiatives have sprouted up since the start of the 21st century as urban development goals have shifted and alarm about global warming has grown.
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