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In September 2019, the UN announced more than 60 countries has signalled their intentions to reduce net carbon emissions to zero by 2050. Even the most committed environmentalists acknowledge that decarbonising over the next 30 years will be a challenge. But one country in Europe has pledged to do it in half that time. That country is Finland. It's one of the most ambitious targets anywhere in the world. But to achieve it, they will have to overcome a powerful fossil fuel industry. Not oil, but peat. Gabriel Gatehouse reports.