Which two aspects of climate change appear to be having the most impact on forests?

The two biggest aspects of the global climate change that impact the forests are the temperature and the precipitation. The temperature increases globally, this affects the forests because the trees are adapted on certain temperatures, but now are faced with rapid increase of the same, and the time for adaptation is much shortened, so lots of forests degrade or gradually die off. The precipitation is a crucial factor for all plants. The forests are on places where there's sufficient amount of precipitation, but now lots of regions in the world are suffering from reduced precipitation, this also causes the degrading and dying off of the forests.

What are the following resources?

Answerlife is suffering;