Jennifer Leaning of Harvard University's FXB Center for Health and Human Rights explains how she realised that climate change has a crucial part to play in human migration. Show more
Marine biologist Professor Callum Roberts of the University of York describes the dramatic changes to the coral reefs he's seen that opened his eyes to global climate change. Show more
Professor Sir John Lawton is an ecologist and birdwatcher since he was a boy. As the climate changes he's seen bird populations in the UK collapsing and replaced by new types. Show more
Geographer Professor Mary Edwards lived in Alaska for many years. As the ice has melted, she has witnessed Arctic villages disappear and ships go through the Northwest Passage. Show more
Five eminent scientists describe the dramatic changes to the natural world that they have witnessed on the ground and tell how their eyes were opened to global climate change. Show more