With COP26 having been and gone, one thing is clear - we need positive climate action. But while climate change has been edging its way into the public consciousness, scientists, innovators, communities and campaigners have been building an strong foundation for change.  We are not starting from square one.
In this bonus episode of Ocean Matters, Helen Czerski meets one of those scientists. Dr Gareth Williams, from the University of Bangor, models climate change to better understand its impact on coral reefs and what may happen to them in the future. 
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