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Five scientists, working in different parts of the world, bear witness to some of the dramatic changes to our planet that have occurred in their lifetimes, as the global climate warms. They share their hopes and fears and report on some ingenious local solutions to rapidly changing conditions.

3. 3 million square kilometres of ice has been lost in the Arctic since 1979. Geographer, Professor Mary Edwards lived in Alaska for many years. She has witnessed a cruise ship navigating the Northwest Passage for the first time and seen villages in the Arctic disappear, as melting ice has led to a dramatic loss of landmass too.