Singapore is planting one million trees to cool its streets, but scientists say the biggest impact could be on air-conditioning bills

As cities across the tropics search for ways to cope with rising temperatures, Singapore has increasingly turned to a familiar, low-tech solution: trees. A specific figure keeps surfacing in planning documents and public discussion: the claim that shading a street with trees can lower street-level temperatures by as much as 2.6 degrees Celsius.

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