Making its international premiere this week at the Toronto Film Festival, the documentary Before the Flood is global travelogue of a world in crisis, following Leonardo DiCaprio as he travels around the globe to chronicle the dangers of climate change.

In September 2014, DiCaprio was named a United Nations Ambassador of Peace. He then teamed with director Fisher Stevens to highlight the areas in world most affected right now by climate disturbances and rising sea levels. Stevens is an actor in his own right (you might’ve just seen him as the pharmacist on The Night Of) though better known in recent years for his documentary work, including the Oscar-winning 2009 dolphin-slaughter exposé The Cove. They met with numerous climate scientists and experts, plus world leaders, including President Obama. (Longtime DiCaprio colleague Martin Scorsese serves as an executive producer; Brett Ratner is also credited as a producer.)

The film journeys to Miami, Beijing, Indonesia, and Canada, among other locales. In the exclusive clip above, DiCaprio is shown watching — and listening — to narwhals (a species of whale with long unicorn horns) along with Dr. Enric Sala while on an ice shelf near the North Pole.

Source: EW