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As we race towards a global population of nine then ten billion, how can we produce enough food to feed us all, given that climate change now directly threatens the very crops which we rely on? In Follow the Food, James Wong explores whether farmers, scientists, tech innovators and consumers can build a new food system that can meet the twin challenges of population growth and climate change. In this final episode of the series, how can farming combat global warming and help to turn back the climate clock?