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Large Impacts of Climatic Warming on Growth of Boreal Forests since 1960
Figure 2
Annual Growing Degree Days (GDD) 1961–2013 for the regions (blue circles).
Also shown are the linear regression lines (black) and the 5-year moving averages from 1963 to 2011 (red lines).
doi: https://doi.org/10.1371/journal.pone.0111340.g002