People are flocking to cities but without changes, infrastructure could buckle under the stress. IF YOU LIKE IT HOT, don't head for the beach. Go to the city. Researchers from Yale University some years ago found the concrete jungle of cities like London creates 'urban heat islands'. Temperatures are noticeably warmer inside the city than even within its own ribbon of green belt - the buildings trap heat by day and release it slowly at night. Yet such grey infrastructure also stores up trouble for the future when you look at the city's ability to survive massive floods.
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