"History teaches us that men and nations behave wisely once they have exhausted all other alternatives"

Abba Eban

"Then I say the Earth belongs to each generation during its course, fully and in its right no generation can contract debts greater than may be paid during the course of its existence"

Thomas Jefferson, September 6, 1789

"If there are to be problems, may they come during my life-time so that I can resolve them and give my children the chance of a good life."

Kenyan proverb


Getting there

Cologne has an excellent position and, as in Roman times, the city is one of the most important traffic hubs in Western Europe. If you want to come by plane, Köln Bonn Airport is connected to more than 130 domestic and international destinations. Via excellent high-speed connections, you can travel by train which is often the fastest and greenest way to the cathedral city in the heart of Europe. Trans-European bus lines stop here too. By car, you can reach Cologne via numerous European motorways to change easily to public transports at Park-and-Ride stations. Of course, you can conveniently dock at the metropolis on the Rhine by ship.

Useful info:


By plane:

Cologne Bonn Airport is the largest low-cost hub in continental Europe. Last year it handled about 10.7 million passengers. Around 60 airlines connect the Airport to over 130 domestic and international destinations in 39 countries. The airport is located approximately 17 km east of Central Cologne and within easy reach of the city centre. To get to the city centre, you can take a 15-min taxi ride (27 EUR) or use the bus & rail services. More info on reaching the conference venue from the airport can is available on our Getting around page.

Link Airport:

To help you with the flight search you can use sites like:


By train:

Cologne train station is situated in the city centre, right next to Cologne’s most popular attraction, a spectacular Gothic cathedral. Passengers travelling to the station can do so via the long-distance ICE high-speed trains, the S-Bahn for shorter distances, the Regionalbahn, or the U-Bahn. Direct trains from major German cities like Stuttgart and Hamburg take 2h 15 mins and 4h respectively, while journeys from Düsseldorf take under 30 mins. It is also possible to travel directly from Brussels in just 1h 45 mins, and from both Dusseldorf’s and Frankfurt’s airports on a direct train in under an hour. Other long-haul journeys from the Rhine-Sieg and Rhine-Ruhr regions arrive into the city’s other major station, Cologne Deutz. Once in Cologne, the subway, bus and tram networks allow visitors to travel easily around the city. With over 207 train and coach companies in and across 44 countries including Deutsche Bahn and Flixtrain, getting to Cologne by train is very easy and convenient.

Link Railway:

Link local public transportation:


Benchmarking the performance of cities across energy, water and environment systems
related metrics presents an opportunity to trigger policy learning, action, and cooperation to bring cities closer to sustainable development.