The number one thing that can make or break the green quotient of a city is the impact of its public transport system, and Copenhagen scores brownie points on all fronts there. Biking is one of the most popular way to get around here, with 546 km of bicycle paths laid out across the city. Despite its popularity, I felt completely safe walking through even the busiest parts of the city at peak hours; dedicated biking lanes make it easy for riders and pedestrians alike, and nothing hampers movement in the world’s most bicycle-friendly capital. Another unique mode I spotted people using is kayaks that can easily navigate the city’s extensive canal system, all while leaving no trace. Other than these offbeat choices to add in your sustainable travel guide to Copenhagen, the more regular public transport options of trains and buses also exists, and which are encouraged over private taxis; there is a remarkable difference in the prices you pay. While public transport is incredibly cheap, private taxis, on the other hand, can cost an arm. I used the Copenhagen Card , an affordable option that made sightseeing around the city with the aid of public transport, a breeze.