Temperature and seasonal changes in a region are the most important climate factors.

Concept: Climatic factors act directly on the growth, survival, reduplication, and movement of individualities and some of these processes can be studied experimentally, as well as by slice in the ocean. 

The integrated goods of the individual processes are observed at the position of populations, communities, or ecosystems. 

In order to convincingly attribute a specific change to climate, one needs to be suitable to identify and describe the processes involved. 

Indeed if the processes are known, and have been studied experimentally, similar as the direct goods of temperature on growth rate, the outgrowth at the population position, over ages of times, can be complex and uncertain