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Temperature-limited ecosystems are believed to be extremely sensitive to global warming and the upward treeline migration is one of the most relevant phenomenon. Long term monitoring of demographic trends appears essential in order to understand possible effects of higher temperatures on cold ecosystems. Long-term monitoring of natality and mortality of a <i>Pinus sylvestris</i> population in the Swedish Scandes from 1973 to 2005 (Kullman 2007) showed that number of trees increased in the study plots due to higher natality rate, especially in the last decade. This reverses a natural trend of treeline decline and recession occurred in the past.