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Carbon is the very essence of life on earth. So how does this element, that is so central to our existence, pose such a threat to the planet? We investigate the story of carbon.
Episode 4 looks at invasive species. Presented by Kathriona Devereux and Fergus McAuliffe.
Bacteria are one of Earth's oldest life forms - dating back over 3 billion years. They're masters of survival and good bacteria help nature function, but some bacteria cause infection and can be deadly