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.

In old-growth forests, trees can grow, live, age, and die naturally, and thereby contribute to the ecosystem rather than being harvested in the prime of their lives. That's why the WWF has nature reserves in Germany where the old-growth forests of tomorrow can develop.