Some good news: Bicycling is hot. In many cities, a bike is a must-have accessory for hipsters, while in the 'burbs spandex-clad weekend warriors rule the roads as they imitate the Tour de France. Major cities around the world have launched bike-sharing programs, and in the US the number of people commuting by bike has gone up 60 percent in the last decade. Whether they're eager for more exercise, passionate about reducing greenhouse gas emissions, or just desperate to stay out of gridlock, more andmore people are hopping onto their bikes.
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