Today’s Solutions: April 21, 2026

There’s a global movement encouraging cities to grow more trees and plan more parks. But which ones have the most green space today? To find out, MIT’s Senseable Lab partnered with the World Economic Forum (WEF) to create Treepedia, a site with interactive maps that show the density of greenery in major cities around the world.The researchers used information from Google Street View to determine what they call the “Green View Index,” a rating that

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