In the midst of a heatwave and severe drought in the United Kingdom this summer, Divya Hariramani was trimming a plum tree in south London when she noticed an issue with one of its branches. The branch was starting to separate from the tree, and workers at Mitcham Community Orchard explained that it was due to the tree being stressed because of the heat. Hariramani, who showcases fruit trees and their caretakers across London on a social media platform named Fruity Walks, highlighted the impact of insufficient water supply on trees during extreme weather conditions.
While London is renowned for its historic stone structures, the city also boasts a vast urban forest, considered one of the largest globally. However, this year has posed challenges for the city’s lush canopy with multiple heatwaves and minimal rainfall straining plants and wildlife. According to a recent report from the Royal Botanic Gardens Kew, London’s urban forest faces a grim future, with approximately 73% of the city’s trees at risk of perishing due to climate change by the end of the century.
The Kew Gardens tree collections team, in collaboration with the Greater London Authority, evaluated over a million public trees and found that 62% of them are ill-suited to the expected climate conditions by 2090 without emission reduction efforts. Additionally, nearly 11% of the trees are categorized as “vulnerable.” The impact of climate change is already evident, as in 2022, 400 trees at Kew Gardens succumbed to extreme heat and drought conditions. A red oak tree skeleton stands as a poignant symbol of the toll climate change is taking on London’s trees.
Kew Gardens emphasized these findings during Climate Action Week, coinciding with a series of heatwaves and a severe drought in Britain. The country experienced its driest July on record, resulting in challenges for farmers, food shortages, and wildfires. In urban areas, park grass turned yellow, and trees exhibited signs of distress, with some shedding leaves prematurely.
With London’s climate projected to resemble that of Barcelona by 2050, botanists are considering planting tree species better suited to warmer and drier conditions. Experts like Joe Richomme from Kew Gardens are exploring tree varieties that can thrive in changing weather patterns while enduring England’s typically wet winters.
Paul Wood, a prominent author focusing on London’s trees, expressed concerns about the impact of extreme heat and drought on the city’s green spaces, including ancient woodlands housing trees over a millennium old. He emphasized the irreplaceable value of these trees, not only for their historical significance but also for the rich biodiversity they sustain.
In conclusion, London’s urban tree canopy faces significant challenges due to climate change, necessitating proactive measures to safeguard its green heritage for future generations.