Produced by The World Wildlife Fund WWF. Anton Reyst travels to Hudson Bay in the north of Canada to get a firsthand look at the effects global warming has had on the landscape and wildlife there.

The original dream of flying fascinates Wolfgang Labudde, owner of Vierwerk GmbH, a company that manufactures light aircraft. He draws his inspiration from the flying machines of Otto Lilienthal, the pioneer and first successful aviator in human history.

Claire finishes her days of work at the call center. When it's finally over, she reflects on her experience. The job as a call center agent is very stressful. No matter what happens, you have to remain friendly and calm!

Claire is really struggling to get to grips with her new job, and the customers aren't exactly making it easy for her...

André Wiersig has become an ambassador for the seas and shares his experiences in talks—he sees this as his purpose on earth. Now he has swum across all seven straits, the last one being the Strait of Gibraltar. What will be his next challenge?

André Wiersig is aware that most people think he is crazy, but for him, crossing the straits and swimming in the ocean is much more than just an athletic challenge.

Strength training is also part of André Wiersig's preparation for his aquatic challenges. That can sometimes be quite painful... This extreme swimmer tells us how he manages to keep the pain at bay.

André Wiersig has had some brushes with death in his time. He tells us about his experiences and the peaceful relationship he has with the other species that swim with him in the ocean.

How does André Wiersig prepare for the cold? How did he get into the game in the first place? Watch this clip to find out.

The 18-kilometer Fehmarn Belt Tunnel connecting Denmark and Germany will be the longest immersed tunnel in the world. This video explains how 360,000 tons of steel and 3 million cubic meters of concrete are being used to create the tunnel, which will run between Rødbyhavn on the island of Lolland and Puttgarden on the eastern coast of Schleswig-Holstein.