As a student of forestry three decades ago, Enda Keane remembers a lecturer standing in the middle of a forest and explaining a future where trees would become commodities in a new way, and forestry owners would be paid not just for growing timber but for capturing carbon from the atmosphere.  Fast forward another fifteen years, and Keane is working with foresters in Finland who were noticing a change in the climate. The hard winters that had always allowed them to drive over the snow and ice to access certain areas with large machinery, were no longer guaranteed, and they…