Can nature help cities address the twin problems of air that is too dirty or too hot? Based on a new report released by The Nature Conservancy – in collaboration with C40 Cities Climate Leadership Group - the answer appears to be a qualified “yes.”
The Planting Healthy Air report identifies the potential return on investment from tree planting in 245 global cities, which currently house about a quarter of the world’s urban population. By collecting and analyzing geospatial information on forest and land cover, particulate matter, and population density and leveraging existing literature, the study estimates the scope of current and future street trees to make urban air healthier. The benefits that trees could afford to cities will be even more crucial in the future, the study finds, as a quarter million people could die each year because of urban heat by 2050, unless cities take proactive steps to adapt to global warming.