While a handful of predominantly wealthy Miami-area cities have been recognized for their lush foliage and tree protection programs, far more communities are left facing the heat.
More than 40 million people in the U S live in urban heat islands, climate group finds nbcnews.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from nbcnews.com Daily Mail and Mail on Sunday newspapers.