Weight of the world part 3: The climate scientists who hold out hope
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b'In the final part of this three-part series, Australian climate scientists Lesley Hughes, Ove Hoegh-Guldberg and Graeme Pearman take stock as they look back on their life\\u2019s work. How does it feel for them to carry this burden of knowledge? Could they have done more? And what hope do they hold for the future?'