In general, the mechanisms that explain how climate variability influences tree growth are known. However, how growth responses vary and distribute among health and viability classes within forest tree populations need to be better understood and pointed out to apply forest planning management under changing climate conditions. Predicting the influence of trends and variability in climate variables on forest health and/or growth responses in the medium term may be a key to develop methods to make climate variability an ordinary and essential tool to achieve the sustainability of uses in forest management where sustainability means biodiversity conservation (or enrichment), mitigation of climate change impacts, carbon dioxide storage, and possibly wood production. In particular, modelling the mechanisms or relationships that use climate variability and trends as main drivers for forest planning and management play a key role in this session.