Photographer James Balog on documenting climate change: "Adventure with a purpose"

Photographer James Balog has become one of the foremost chroniclers of human-caused climate change, as his cameras have tracked the dramatic effects – vanishing ice, rising seas, fires, and the toll climate change is taking on all living things. He tells correspondent Ben Tracy that his photos are his testimony, a record of our past and present, and a message for the future.

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