More than 70 major cities around the world have pledged to end their reliance on fossil fuels and become carbon neutral by 2050. However, Copenhagen aims to accomplish this goal in the next seven years. Bikes play a central role in the strategy of the Danish capital. While other cities have parking garages for cars, Copenhagen has them for bicycles. Virtually all its 600,000 residents own a bicycle, and the city has more than 200 miles of dedicated cycle lanes.