CHELSEA, Mass. — As coastlines recede with global warming, so-called heat islands are growing. These are dense urban areas where cement or asphalt cover most of the ground, where multi-story buildings — often brick — bake in the sun, and where there are few trees.
Daily temperatures in these spots can be 20 to 50 degrees hotter than in leafy suburbs. For residents of these islands, health risks rise with the heat.
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